{"id":1363,"date":"2021-11-08T10:30:00","date_gmt":"2021-11-08T10:30:00","guid":{"rendered":"http:\/\/124.223.68.123\/?p=1363"},"modified":"2024-06-19T12:11:47","modified_gmt":"2024-06-19T12:11:47","slug":"1363-2","status":"publish","type":"post","link":"https:\/\/www.zenosic.com\/en\/1363-2\/","title":{"rendered":"\u671d\u82b1\u5915\u62fe-\u62a5\u6587\u7f13\u5b58\u4e4b\u4e8c"},"content":{"rendered":"<p><strong>\u524d\u8a00<\/strong><br>\u4e0d\u540c\u65f6\u4ee3\u7684\u6570\u901a\u7f51\u7edc\u6280\u672f\uff0c\u90fd\u6709\u7740\u5176\u5f53\u65f6\u7684\u8d21\u732e\u3002\u8ba9\u6211\u4eec\u8fdb\u5165\u65f6\u5149\u96a7\u9053\uff0c\u8ddf\u968f\u524d\u8f88\u7684\u8db3\u8ff9\uff0c\u53bb\u63a2\u8bbf\u524d\u8f88\u4eec\u57a6\u8352\u7684\u5e74\u4ee3\u5427\u3002<br>\u672c\u6587\u65e2\u975e\u4ea7\u54c1\u5de5\u7a0b\u6280\u672f\u6587\u6863\uff0c\u4ea6\u975e\u539f\u5382\u6587\u5ba3\uff0c\u4e43\u671d\u82b1\u5915\u62fe\uff0c\u53f2\u6d77\u62fe\u8d1d\uff0c\u6e29\u6545\u800c\u77e5\u65b0\uff0c\u6587\u7b14\u7c97\u62d9\uff0c\u8d3b\u7b11\u5927\u65b9\u3002<\/p>\n\n\n\n<p><strong><br><\/strong>&lt;\u7eed\u524d\u6587&gt;<\/p>\n\n\n\n<p><strong>\u7a81\u53d1\u62a5\u6587\u6d41\u91cf(packet burst)<\/strong><\/p>\n\n\n\n<p>\u4f17\u6240\u5468\u77e5\uff0c\u62a5\u6587\u7f13\u5b58\u5e94\u8be5\u8bbe\u8ba1\u4e3a\u7ba1\u7406\u6d41\u91cf\u7684&#8221;\u7a81\u53d1&#8221;\uff0c\u4f46\u5bf9\u4e8e\u8fd9\u610f\u5473\u7740\u4ec0\u4e48\u6ca1\u6709\u5355\u4e00\u7684\u5b9a\u4e49\u3002\u5728\u8f83\u9ad8\u7ea7\u522b\uff0c\u8be5\u672f\u8bed\u901a\u5e38\u662f\u6307\u4e0d\u5c5e\u4e8e\u6301\u7eed\u62e5\u585e\u7684\u6d41\u91cf\u7684\u4e34\u65f6\u589e\u52a0\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u5206\u949f\u5185\u5e73\u5747\u5229\u7528\u7387\u4e3a5%\u7684\u94fe\u8def\u5982\u679c\u51fa\u73b0\u8f93\u51fa\u4e0b\u964d\uff0c\u5219\u53ef\u80fd\u4f1a\u9047\u5230\u8d85\u51fa\u5176\u7f13\u5b58\u5bb9\u91cf\u7684\u7a81\u53d1\u62a5\u6587\u6d41\u91cf\u3002<\/p>\n\n\n\n<p>\u7a81\u53d1\u62a5\u6587\u6d41\u91cf\u7684\u6784\u6210\u6216\u5b9a\u4e49\u7a81\u53d1\u7c7b\u578b\u53d6\u51b3\u4e8e\u7f51\u7edc\u4e0a\u4e0b\u6587\u3002\u4ece\u4e3b\u673a\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u4e00\u79cd\u660e\u663e\u7684\u5fae\u7206\u53d1\u60c5\u51b5\u662f\u5f53\u4e3b\u673a\u751f\u6210\u5927\u91cf\u62a5\u6587\u4ee5\u54cd\u5e94\u5355\u4e2a\u4e8b\u4ef6\u65f6\u3002\u4f8b\u598210GE\u8fde\u63a5\u7684\u670d\u52a1\u5668\u6536\u5230\u7684\u5355\u4e2a TCP ACK\u4f20\u8fbe\u4e86\u5927\u91cf\u6bb5\u5df2\u4e22\u5931\uff0c\u5219\u53d1\u9001\u7aef\u53ef\u80fd\u4f1a\u7acb\u5373\u66ff\u6362\u6240\u6709\u8fd9\u4e9b\u6bb5\u3002\u65e0\u8bba\u63a5\u53e3\u901f\u5ea6\u4f4e\u4e8e10G\uff0c\u5373\u4f7f\u6ca1\u6709\u6301\u7eed\u7684\u62e5\u585e\uff0c\u4e5f\u9700\u8981\u5bf9\u5b83\u4eec\u8fdb\u884c\u7f13\u5b58\u3002<\/p>\n\n\n\n<p>\u6bcf\u5f53\u6cbf\u8def\u5f84\u51fa\u73b0\u63a5\u53e3\u901f\u5ea6\u4e0b\u964d\u65f6\uff0c\u5fae\u7206\u53d1\u884c\u4e3a\u5c31\u5f88\u5e38\u89c1\u3002\u8d85\u989d\u8ba2\u9605\uff08\u8fc7\u8f7d\uff09\u4e5f\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u7279\u522b\u662f\u5f53\u6d41\u91cf\u7531Hadoop\/MapReduce\u7b49\u5e94\u7528\u7a0b\u5e8f\u540c\u6b65\u65f6\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\uff0c\u5e94\u5bf9\u63aa\u65bd\u662f\u7f13\u5b58\u7a81\u53d1\uff0c\u907f\u514d\u62a5\u6587\u4e22\u5931\uff0c\u4ece\u800c\u4e0d\u5411\u53d1\u9001\u7aef\u53d1\u51fa\u51cf\u901f\u7684\u4fe1\u53f7\u3002\u5728\u80a1\u7968\u4ea4\u6613\u4e2d\uff0c\u7f13\u5b58\u751a\u81f3\u5fae\u7a81\u53d1\u800c\u589e\u52a0\u7684\u5ef6\u8fdf\u53ef\u80fd\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\uff0c\u552f\u4e00\u7684\u89e3\u51b3\u65b9\u6848\u662f\u589e\u52a0\u94fe\u8def\u5e26\u5bbd\u3002\u5f53\u5b58\u5728\u4e00\u5b9a\u8303\u56f4\u7684\u94fe\u8def\u901f\u5ea6\u65f6\uff0c\u6d41\u7684\u62a5\u6587\u4f1a\u5206\u6563\u5728\u8f83\u5feb\u7684\u94fe\u8def\u4e0a\uff0c\u56e0\u4e3a\u901a\u8fc7\u6162\u901f\u94fe\u8def\u8fd4\u56de\u7684ACK\u4f1a\u4e3a\u5c06\u6765\u7684\u4f20\u8f93\u8ba1\u65f6\u3002<\/p>\n\n\n\n<p><strong>\u7f13\u5b58\u81a8\u80c0\uff08bufferbloat\uff09<\/strong><\/p>\n\n\n\n<p>Jim Gettys\u5bf9\u7f13\u5b58\u4e0eTCP\u7684\u4ea4\u4e92\u8fdb\u884c\u4e86\u5e7f\u6cdb\u7684\u7814\u7a76\u3002\u5176\u7814\u7a76\u59cb\u4e8e\u73b0\u5b9e\u4e16\u754c\u7684\u7ecf\u9a8c\uff0c\u5e76\u4e13\u6ce8\u4e8e\u8fc7\u591a\u7f13\u5b58\u7684\u6765\u6e90\u548c\u5f71\u54cd\u3002\u4ed6\u57282011\u5e74\u53d1\u8868\u7684IEEE\u8bba\u6587\u4e2d\u8868\u793a\uff1a&#8221;\u867d\u7136\u9700\u8981\u4e00\u4e9b\u7f13\u5b58\u6765\u5e73\u6ed1\u901a\u4fe1\u7cfb\u7edf\u4e2d\u7684\u7a81\u53d1\uff0c\u4f46\u5ffd\u7565\u4e86\u57fa\u672c\u539f\u7406\uff1a\u62a5\u6587\u4e22\u5931\uff08\u76ee\u524d\uff09\u662f\u7f51\u7edc\u4e2d\u4fe1\u53f7\u62e5\u585e\u7684\u552f\u4e00\u65b9\u6cd5\uff0c\u800cTCP\u7b49\u907f\u514d\u62e5\u585e\u7684\u534f\u8bae\u4f9d\u8d56\u4e8e\u53ca\u65f6\u7684\u62e5\u585e\u901a\u77e5\u6765\u8c03\u8282\u5176\u4f20\u8f93\u901f\u5ea6\u3002\u201c\u672a\u53ca\u65f6\u6536\u5230\u901a\u77e5\u7684\u7ed3\u679c\u662fTCP\u65e0\u6cd5\u4ee5\u6700\u4f73\u6027\u80fd\u8fd0\u884c\uff0c\u4ece\u800c\u5bfc\u81f4\u541e\u5410\u91cf\u964d\u4f4e\u3001\u5ef6\u8fdf\u9ad8\u548c\u91cd\u65b0\u4f20\u8f93\uff0c\u4ece\u800c\u5bfc\u81f4\u62e5\u585e\u6c38\u4e45\u5316\u3002<\/p>\n\n\n\n<p><strong>\u5e94\u7528\u62e5\u585e\u63a7\u5236\u6982\u5ff5<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u6ca1\u6709&#8221;\u8db3\u591f&#8221;\u7684\u7f13\u5b58\uff0c\u5b83\u5c06\u5728\u5e94\u7528\u7a0b\u5e8f\u5e0c\u671b\u5ef6\u8fdf\u7684\u77ed\u6682\u62e5\u585e\u671f\u95f4\u4e22\u5f03\u62a5\u6587\u3002\u6839\u636e\u4e22\u5931\u68c0\u6d4b\u673a\u5236\uff0cTCP\u5c06\u5ef6\u8fdf\u6162\u542f\u52a8\u659c\u5761\u4e0a\u5347\uff0c\u8fdb\u5165\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\/\u6062\u590d\uff0c\u6216\u4ece\u907f\u514d\u62e5\u585e\u8fd4\u56de\u5230\u6162\u542f\u52a8\u3002\u5f53\u62e5\u585e\u6301\u7eed\u5b58\u5728\u65f6\uff0c\u5176\u4e2d\u4e00\u4e9b\u54cd\u5e94\u7684\u5f71\u54cd\u6700\u5c0f\uff08\u5728Netflix\u7535\u5f71\u4e2d\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\uff09\u662f\u53ef\u4ee5\u7684\uff0c\u4f46\u5f53\u62e5\u585e\u6301\u7eed\u65f6\u95f4\u6709\u9650\u5e76\u4e14\u540e\u7eed\u62a5\u6587\u5c06\u4ee5\u539f\u59cb\u901f\u7387\u8f6c\u53d1\u65f6\uff0c\u5219\u4e0d\u662f\u3002\u8c37\u6b4c\u7684\u5b9e\u9a8c\u5f3a\u8c03\u4e86\u4e22\u5f03\u5bf9\u7f51\u7edc\u6d41\u91cf\u7684\u8d1f\u9762\u5f71\u54cd\uff0c\u5bfc\u81f4\u4f1a\u8bdd\u5b8c\u6210\u5ef6\u8fdf\u660e\u663e\u9ad8\u4e8e\u65e0\u4e22\u5f03\u5ef6\u8fdf\u3002<\/p>\n\n\n\n<p>\u8fd8\u5b58\u5728\u7f13\u5b58\u8fc7\u591a\u7684\u98ce\u9669\u3002\u7814\u7a76\u53d1\u73b0\uff0cTCP\u901a\u5e38\u4f9d\u9760\u62a5\u6587\u4e22\u5f03\u4fe1\u53f7\u6765\u9650\u5236\u5176\u4f20\u8f93\u3002\u4e0d\u4e22\u5f03\u62a5\u6587\u53ef\u80fd\u4f1a\u5bfc\u81f4\u62e5\u585e\u7a97\u53e3\u53d8\u5927\u5230\u5408\u7406\u8303\u56f4\uff0c\u4ece\u800c\u8fdb\u4e00\u6b65\u589e\u52a0\u62e5\u585e\u3002\u4e0d\u4e22\u5f03\u62a5\u6587\u4f1a\u5411\u4e3b\u673a\u53d1\u9001\u4fe1\u53f7\u4ee5\u63d0\u9ad8\u5176\u4f20\u8f93\u901f\u7387\u3002\u81a8\u80c0\u7684\u62e5\u585e\u7a97\u53e3\u8fd8\u5c06\u963b\u6b62\u65b0\u6d41\u83b7\u53d6\u7f51\u7edc\u5e26\u5bbd\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u73b0\u6709\u6d41\u7ee7\u7eed\u53d1\u9001\u5927\u578b\u7a81\u53d1\u3002\u8fc7\u591a\u7f13\u5b58\u5f15\u5165\u7684\u5ef6\u8fdf\u4e5f\u4f1a\u626d\u66f2RTT\u548cRTT\u65b9\u5dee\u8ba1\u7b97\uff0c\u4ece\u800c\u5f71\u54cdRTO\u5b9a\u65f6\u5668\uff0c\u4ece\u800c\u5bfc\u81f4\u635f\u5931\u68c0\u6d4b\u901f\u5ea6\u53d8\u6162\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u5982\u679c\u672c\u6765\u4f1a\u89e6\u53d1\u91cd\u590dACK\u7684\u62a5\u6587\u5728\u7f13\u5b58\u4e2d\u5ef6\u8fdf\uff0c\u5219\u4e0d\u592a\u53ef\u80fd\u901a\u8fc7\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u6765\u68c0\u6d4b\u548c\u6062\u590d\u4e22\u5931\u7684\u62a5\u6587\u3002\u8fd9\u4f1a\u5bfc\u81f4RTO\u548c\u4f1a\u8bdd\u8fd4\u56de\u6162\u901f\u542f\u52a8\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u901a\u8fc7\u5feb\u901f\u6062\u590d\u6765\u7f29\u5c0f\u5176\u7a97\u53e3\u3002\u6b64\u5916\uff0c\u5982\u679c\u7f13\u5b58\u663e\u8457\u589e\u52a0\u4e86RTT\uff0c\u5219\u6027\u80fd\u5c06\u4f1a\u964d\u4f4e\uff0c\u56e0\u4e3a\u53d1\u9001\u7aef\u53ea\u80fd\u4e3a\u6bcf\u4e2aRTT \u4f20\u8f93\u4e00\u5b9a\u6570\u91cf\u7684\u6bb5\u3002\u7f13\u5b58\u8fc7\u591a\u7684\u98ce\u9669\u53ef\u4ee5\u901a\u8fc7\u53ef\u914d\u7f6e\u7684\u961f\u5217\u957f\u5ea6\u3001AQM\u6280\u672f\uff08\u5982WRED\uff09\u548cQoS\u673a\u5236\u6765\u7ba1\u7406\uff0c\u4ee5\u4f18\u5148\u5904\u7406\u91cd\u8981\u6d41\u91cf\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5b58\u5728\u7f13\u5b58\u592a\u5c0f\u6216\u592a\u5927\u7684\u98ce\u9669\u3002\u7ed9\u5b9a\u94fe\u8def\u7684\u6700\u4f73\u5927\u5c0f\u5c06\u53d6\u51b3\u4e8e\u8bb8\u591a\u56e0\u7d20\uff0c\u5305\u62ec\u7f51\u7edc\u4e2d\u7684\u4f4d\u7f6e\uff08\u4f8b\u5982\uff0cRTT\uff0c\u94fe\u8def\u901f\u5ea6\uff0c\u8d85\u989d\u8ba2\u9605\uff0c\u6d41\u91cf\u8ba1\u6570\u548c\u62e5\u585e\uff09\u548c\u5e94\u7528\u7a0b\u5e8f\u4ee5\u53ca\u5546\u4e1a\u8003\u8651\u56e0\u7d20\uff0c\u5982\u4ef7\u683c\u548c\u6301\u7eed\u8d39\u7528\u3002<\/p>\n\n\n\n<p><strong>\u8001\u9f20\u6d41\u548c\u5927\u8c61\u6d41<\/strong><\/p>\n\n\n\n<p>\u7f51\u7edc\u548c\u7f13\u5b58\u8bbe\u8ba1\u4e2d\u7684\u590d\u6742\u56e0\u7d20\u662fTCP\u6d41\u7684\u53d8\u5316\u3002\u5927\u8c61\u6d41\u6bcf\u6b21\u6d41\u91cf\u6d88\u8017\u5927\u91cf\u5e26\u5bbd\u3002\u5b83\u4eec\u7684\u5bff\u547d\u76f8\u5bf9\u8f83\u957f\uff0c\u56e0\u6b64\u5927\u90e8\u5206\u65f6\u95f4\u90fd\u5904\u4e8e\u62e5\u585e\u907f\u514d\u6a21\u5f0f\uff0c\u7f51\u7edc\u4e2d\u7684\u7f51\u6bb5\u7a97\u53e3\u5f88\u5927\u3002\u5982\u679c\u7ba1\u7406\u4e0d\u5f53\uff0c\u5b83\u4eec\u53ef\u80fd\u4f1a\u4f7f\u5176\u4ed6\u6d41\u91cf\u6328\u997f\u3002<\/p>\n\n\n\n<p>\u8001\u9f20\u6d41\u662f\u77ed\u6682\u7684\uff0c\u8bb8\u591a\u8001\u9f20\u6d41\u5728\u6ca1\u6709\u79bb\u5f00\u6162\u542f\u52a8\u7684\u60c5\u51b5\u4e0b\u5b8c\u6210\u3002\u5927\u8c61\u6d41\u5f80\u5f80\u5360\u7528\u5e26\u5bbd\uff0c\u800c\u8001\u9f20\u6d41\u5219\u591a\u4e3a\u77ed\u65f6\u6d41\u91cf\u3002\u5f53\u8001\u9f20\u548c\u5927\u8c61\u5171\u4eab\u7f13\u5b58\u65f6\uff0c\u5bf9\u8001\u9f20\u6d41\u6765\u8bf4\u5e76\u4e0d\u603b\u662f\u6548\u679c\u5f88\u597d\uff0c\u7279\u522b\u662f\u5f53\u5927\u8c61\u6d41\u5bf9\u62e5\u5835\u6ca1\u53cd\u5e94\u7684\u65f6\u5019\u3002\u5b83\u4eec\u5728\u5e94\u7528\u7a0b\u5e8f\uff08\u5982Map\/Reduce\uff09\u4e2d\u7684\u6570\u636e\u4e2d\u5fc3\u4e2d\u63d0\u51fa\u4e86\u72ec\u7279\u7684\u7f13\u5b58\u6311\u6218\uff0c\u5176\u4e2d\u4e00\u53f0\u670d\u52a1\u5668\u53ef\u80fd\u542f\u52a8\u4e0e\u6570\u767e\u6216\u6570\u5343\u53f0\u5176\u4ed6\u670d\u52a1\u5668\u7684\u8fde\u63a5\uff0c\u4ece\u800c\u521b\u5efa\u591a\u5bf9\u4e00\u54cd\u5e94\u3002\u56e0\u4e3a\u5b83\u4eec\u662f\u77ed\u6682\u7684\uff0c\u8001\u9f20\u6d41\u4e0d\u5bb9\u6613\u4e0e\u63a7\u5236\u5927\u8c61\u6d41\u7684\u62e5\u5835\u548c\u961f\u5217\u7ba1\u7406\u65b9\u6848\u5171\u5b58\u3002\u5b83\u4eec\u4e0d\u9700\u8981\u51cf\u6162\u901f\u5ea6\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u5f88\u5feb\u5b8c\u6210\uff0c\u964d\u901f\u4f1a\u9020\u6210\u6d41\u91cf\u5ef6\u8fdf\u4f20\u8f93\u3002<\/p>\n\n\n\n<p>\u5f53\u5b58\u5728\u591a\u4e2a\u8def\u5f84\uff08\u5982L3 ECMP\uff09\u65f6\uff0c\u5927\u8c61\u6d41\u8fd8\u4f1a\u5f15\u8d77\u95ee\u9898\u3002\u5982\u679c\u592a\u591a\u7684\u5927\u8c61\u6d41\u6563\u5217\u5728\u540c\u4e00\u94fe\u8def\u4e0a\uff0c\u5373\u4f7f\u5176\u4ed6\u94fe\u8def\u4e0a\u4ecd\u6709\u53ef\u7528\u5e26\u5bbd\uff0c\u4e5f\u53ef\u80fd\u4f1a\u53d1\u751f\u4e25\u91cd\u7684\u62e5\u585e\u3002<\/p>\n\n\n\n<p>\u5e76\u975e\u6240\u6709\u7684\u4e2a\u4f53\u6d41\u90fd\u662f\u5927\u8c61\u6d41\u6216\u8001\u9f20\u6d41\u3002HTTPv2\u652f\u6301\u4f4e\u5bb9\u91cf\u957f\u671f\u4f1a\u8bdd\uff0c\u56e0\u6b64\u4e0d\u4f1a\u7ecf\u5e38\u521b\u5efa\u65b0\u5957\u63a5\u5b57\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cTCP\u4ecd\u5e94\u9075\u5b88\u5728\u5904\u4e8e\u975e\u6d3b\u52a8\u72b6\u6001\u540e\u51cf\u5c11\u62e5\u585e\u7a97\u53e3\u7684\u51c6\u5219\u3002<\/p>\n\n\n\n<p>\u8001\u9f20\u6d41\u548c\u5927\u8c61\u6d41\u7684\u5b58\u5728\u53ca\u5176\u884c\u4e3a\u662f\u96be\u4ee5\u4e3a\u6570\u636e\u4e2d\u5fc3\u7f51\u7edc\u63d0\u51fa\u4efb\u4f55\u901a\u7528\u89e3\u51b3\u65b9\u6cd5\u7684\u539f\u56e0\u4e4b\u4e00\u3002\u5b66\u672f\u754c\u548c\u5de5\u4e1a\u754c\u76ee\u524d\u8fd8\u6b63\u5728\u7814\u7a76\u8fd9\u4e9b\u4e0d\u540c\u7c7b\u578b\u7684\u6d41\u5171\u5b58\u7684\u6700\u4f73\u65b9\u5f0f\u3002\u8bf8\u5982\u8c03\u5ea6\uff0c\u5212\u5206\u6216\u8bc6\u522b\u548c\u5f15\u5bfc\u5927\u8c61\u6d41\u7b49\u89e3\u51b3\u65b9\u6848\u4e5f\u90fd\u8fd8\u5728\u4e0d\u65ad\u63a2\u7d22\u4e2d\u3002<\/p>\n\n\n\n<p><strong>TCP\u6458\u8981<\/strong><\/p>\n\n\n\n<p>TCP\u901a\u8fc7\u8fd4\u56de\u6162\u542f\u52a8\uff08RTO\u68c0\u6d4b\uff09\u3001\u505c\u6b62\u7a97\u53e3\u589e\u957f\uff08\u5728\u4f7f\u7528\u672a\u89e3\u6790\u7684\u6bb5\u8fdb\u884c\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u671f\u95f4\uff09\u6216\u51cf\u5c11\u62e5\u585e\u7a97\u53e3\uff08\u5feb\u901f\u6062\u590d\uff09\u6765\u54cd\u5e94\u62a5\u6587\u4e22\u5931\u3002\u62a5\u6587\u4e22\u5931\u672c\u8eab\u5bf9\u4f20\u8f93TCP\u6d41\u91cf\u7684\u7f51\u7edc\u5e76\u4e0d\u6709\u5bb3\u3002\u5b9e\u9645\u4e0a\uff0c\u4f7f\u7528\u5f53\u524d\u90e8\u7f72\u7684\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff0c\u5b83\u662fTCP\u5728\u5b58\u5728\u62e5\u585e\u7684\u60c5\u51b5\u4e0b\u6b63\u5e38\u8fd0\u884c\u7684\u5fc5\u8981\u5de5\u5177\u3002\u5f53\u53ef\u4ee5\u901a\u8fc7SACK\u548c\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u6062\u590d\u5206\u6bb5\u65f6\uff0c\u76f8\u5bf9\u4e8e\u5927\u591a\u6570\u5e94\u7528\u7a0b\u5e8f\u7684\u8981\u6c42\uff0c\u5206\u6bb5\u4e22\u5931\u53ef\u80fd\u4e0d\u4f1a\u663e\u8457\u964d\u4f4e\u4f1a\u8bdd\u7684\u603b\u4f53\u541e\u5410\u91cf\u3002\u901a\u8fc7RTO\u68c0\u6d4b\u5230\u7684\u62a5\u6587\u4e22\u5931\u66f4\u6709\u5bb3\uff0c\u56e0\u4e3a\u5b83\u4f1a\u4f7fTCP\u4f1a\u8bdd\u8fd4\u56de\u5230\u6162\u901f\u542f\u52a8\u3002\u591a\u4e2aRTO\u662f\u6700\u574f\u7684\u60c5\u51b5\uff0c\u5982\u679c\u53ef\u80fd\u7684\u8bdd\uff0c\u5e94\u8be5\u907f\u514d\uff0c\u56e0\u4e3a\u5b83\u4f1a\u5927\u5927\u51cf\u6162\u4f1a\u8bdd\u901f\u5ea6\u3002\u65e0\u9650\u7f13\u5b58\u4e0d\u4f1a\u963b\u6b62RTO\uff0c\u4f46\u5b83\u53ef\u80fd\u4f1a\u901a\u8fc7\u5ef6\u8fdf\u4ee5\u540e\u7684\u62a5\u6587\u6765\u9632\u6b62\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u3002<\/p>\n\n\n\n<p>TCP\u8fd8\u54cd\u5e94\u62a5\u6587\u4e22\u5931\u4ee5\u5916\u7684\u4fe1\u53f7\u3002\u5f53\u7f51\u7edc\u4e2d\u9700\u8981\u6301\u7eed\u7f13\u5b58\u65f6\uff0cTCP\u901a\u8fc7\u589e\u52a0RTO\u6765\u54cd\u5e94\u589e\u52a0\u7684RTT\u548cRTT\u65b9\u5dee\u3002\u8fd9\u4f1a\u51cf\u6162\u901a\u8fc7RTO\u8d85\u65f6\u68c0\u6d4b\u4e22\u5931\u7684\u901f\u5ea6\u3002<\/p>\n\n\n\n<p>\u5173\u4e8e\u4e3aTCP\u6d41\u91cf\u8bbe\u8ba1\u7f51\u7edc\uff0c\u76ee\u6807\u5e94\u8be5\u662f\u7ba1\u7406\u826f\u597d\u7684\u7f13\u5b58\u548c\u5e94\u7528\u7a0b\u5e8f\u8981\u6c42\u5b9a\u4e49\u7684\u9002\u5f53\u62a5\u6587\u4e22\u5f03\u3002\u7f51\u7edc\u7684\u7406\u60f3\u7f13\u5b58\u91cf\u5e94\u7531\u5e94\u7528\u7a0b\u5e8f\u3001\u5e26\u5bbd\u3001\u5f80\u8fd4\u65f6\u95f4\u548c\u6d41\u91cf\u7279\u6027\u7684\u7ec4\u5408\u786e\u5b9a\u3002<\/p>\n\n\n\n<p><strong>\u7f13\u5b58\u76f8\u5173\u7684\u5b66\u672f\u7814\u7a76<\/strong><\/p>\n\n\n\n<p>\u5728\u7f13\u5b58\u5927\u5c0f\u8c03\u6574\u65b9\u9762\u88ab\u5f15\u7528\u6700\u591a\u7684\u65e9\u671f\u8bba\u6587\u662fCurtis Villamizar\u548cChengSong\u57281994\u5e74\u53d1\u8868\u7684&#8221;ANSNET\u4e2d\u7684\u9ad8\u6027\u80fdTCP&#8221;\u3002\u672c\u6587\u63a2\u8ba8\u4e86\u4f7f\u7528\u975e\u5e38\u5c11\u91cf\u7684\u957f\u5bff\u547dTCP\u6d41\u6700\u5927\u9650\u5ea6\u5730\u63d0\u9ad8\u94fe\u8def\u5229\u7528\u7387\u6240\u9700\u7684\u7f13\u5b58\u3002\u5bf9\u4e8e\u5c11\u91cf\u4f1a\u8bdd\uff0c\u62a5\u6587\u4e22\u5931\u53ef\u80fd\u5bfc\u81f4\u6240\u6709\u4f1a\u8bdd\u540c\u65f6\u8fd4\u56de\u6162\u901f\u542f\u52a8\uff0c\u4ece\u800c\u540c\u65f6\u4ee5\u6307\u6570\u65b9\u5f0f\u589e\u52a0\u5176\u901f\u7387\u3002\u5f53\u518d\u6b21\u53d1\u751f\u62e5\u585e\u65f6\uff0c\u4f1a\u8bdd\u5c06\u53d8\u4e3a\u540c\u6b65\u72b6\u6001\uff0c\u5e76\u91cd\u590dTCP \u540c\u6b65\u7684\u5faa\u73af\u3002\u8be5\u8bba\u6587\u7684\u7ed3\u8bba\u662f\uff0c\u901a\u8fc7\u5c06\u7f13\u5b58\u5927\u5c0f\u8c03\u6574\u4e3a\u5e26\u5bbd\u548c\u8def\u7531\u884c\u7a0b\u65f6\u95f4\u7684\u4e58\u79ef\uff0c\u74f6\u9888\u94fe\u8def\u5229\u7528\u7387\u6700\u5927\u5316\u3002\u6b64\u503c\u79f0\u4e3a\u5e26\u5bbd\u5ef6\u8fdf\u79ef\uff08BDP\uff09\u3002\u4f8b\u5982\uff0c\u4f5c\u4e3a\u603bRTT\u4e3a0.2\u79d2\u7684\u8def\u5f84\u7684\u4e00\u90e8\u5206\u768410 Gbps\u94fe\u8def\u5c06\u5177\u67092\u5343\u5146\u4f4d\u6216250 MB\u7684\u7f13\u5b58\u3002\u4f5c\u8005\u8ba4\u4e3a\uff0c\u589e\u52a0\u6d41\u91cf\u5c06\u5bfc\u81f4\u4e0d\u540c\u7684\u7ed3\u679c\u3002\u4e8c\u4f4d\u4f5c\u8005\u4e3a\u7f13\u5b58\u4e0e TCP\u7684\u4ea4\u4e92\u63d0\u4f9b\u4e86\u5b9d\u8d35\u7684\u89c1\u89e3\u3002\u53ef\u60dc\uff0c\u8fd9\u4e2a\u7279\u5b9a\u6848\u4f8b\u7684\u5efa\u8bae\u591a\u5e74\u6765\u4e00\u76f4\u6210\u4e3a\u6559\u6761\uff0c\u5e76\u5bfc\u81f4\u5728\u5176\u6761\u4ef6\u4e0d\u9002\u7528\u7684\u5730\u65b9\u9020\u6210\u8fc7\u5ea6\u914d\u7f6e\u7f51\u7edc\u7f13\u5b58\u3002<\/p>\n\n\n\n<p>\u65af\u5766\u798f\u548c\u4f50\u6cbb\u4e9a\u7406\u5de5\u5b66\u9662<\/p>\n\n\n\n<p>\u7531\u5c3c\u514b\u00b7\u9ea6\u514b\u6b27\u6587\uff08NickMcKeown\uff09\u9886\u5bfc\u7684\u65af\u5766\u798f\u5927\u5b66\u9ad8\u6027\u80fd\u7f51\u7edc\u5c0f\u7ec4\uff08High Performance Networking Group\uff09\u4e00\u76f4\u662f\u5bf9\u7f51\u7edc\u7684\u8bb8\u591a\u65b9\u9762\u8fdb\u884c\u91cd\u8981\u7814\u7a76\u7684\u6765\u6e90\u3002Guido Appenzeller 2005\u5e74\u7684\u8bba\u6587&#8221;\u8c03\u6574\u8def\u7531\u5668\u7f13\u5b58\u7684\u5927\u5c0f&#8221;\u4e3a\u5177\u6709\u8bb8\u591a\u6d41\u7684Internet\u6838\u5fc3\u8def\u7531\u5668\u63d0\u4f9b\u4e86\u6709\u4ef7\u503c\u7684\u89c1\u89e3\u548c\u57fa\u4e8e\u7edf\u8ba1\u6570\u636e\u7684\u7f13\u5b58\u5927\u5c0f\u8c03\u6574\u65b9\u6cd5\u3002\u5bf9\u4e8e\u8bb8\u591a\u6d41\uff0c\u6d41\u91cf\u53ef\u80fd\u4e0d\u540c\u6b65\uff0c\u4ece\u800c\u5bfc\u81f4\u805a\u5408\u5e73\u6ed1\u6548\u679c\uff0c\u56e0\u6b64\u9700\u8981\u8f83\u5c11\u7684\u7f13\u5b58\u3002\u8fd9\u9879\u7814\u7a76\u7684\u4e3b\u8981\u5efa\u8bae\u662f\uff0c\u7f13\u5b58\u7684\u5927\u5c0f\u5e94\u57fa\u4e8eBDP\u548c\u901a\u8fc7\u94fe\u8def\u7684\u5927\u8c61\u6d41\uff08TCP\u6d41\u4e0d\u662f\u6162\u901f\u542f\u52a8\uff09\u7684\u6570\u91cf\u3002\u5177\u4f53\u800c\u8a00\uff1aBW * RTT \/ sqrt\uff08n\uff09\uff0c\u5176\u4e2dn \u662f\u5927\u8c61\u6d41\u91cf\u7684\u6570\u76ee\u3002n\u8fd8\u5f15\u5165\u4e86\u4e00\u79cd\u8868\u793a\u5e94\u7528\u7a0b\u5e8f\u7279\u5f81\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5e8f\uff08\u89c6\u9891\u4e0e\u5c0f\u578bWeb\u4e0b\u8f7d\uff09\u5728\u907f\u514d\u62e5\u585e\u65b9\u9762\u82b1\u8d39\u7684\u65f6\u95f4\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002\u8fd9\u5f88\u91cd\u8981\uff0c\u56e0\u4e3a\u8bb8\u591aTCP \u6d41\u4ece\u4e0d\u79bb\u5f00\u6162\u542f\u52a8\u3002\u5176\u7814\u7a76\u548c\u6a21\u62df\u4fa7\u91cd\u4e8e\u6838\u5fc3\u94fe\u63a5\uff0c\u4f46\u7f13\u5b58\u548c\u6d41\u52a8\u4e4b\u95f4\u6bd4\u4f8b\u7684\u4e00\u822c\u6982\u5ff5\u53ef\u4ee5\u5e94\u7528\u4e8e\u5176\u4ed6\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u8fb9\u7f18\u8def\u7531\u5668\u9762\u5411\u6838\u5fc3\u7684\u4e0a\u884c\u94fe\u8def\u53ef\u80fd\u5177\u6709\u4e2d\u7b49\u6570\u91cf\u7684\u6d41\uff0c\u56e0\u6b64\u9700\u8981\u7684\u7f13\u5b58\u6bd4\u540c\u4e00\u8def\u7531\u5668\u4e0a\u9762\u5411\u5ba2\u6237\u7684\u94fe\u8def\u5c11\uff0c\u800c\u540c\u4e00\u8def\u7531\u5668\u4e0a\u7684\u6240\u6709\u5e26\u5bbd\u53ef\u80fd\u88ab\u5355\u4e2a\u6d41\u6d88\u8017\u3002<\/p>\n\n\n\n<p>\u4f50\u6cbb\u4e9a\u7406\u5de5\u5b66\u9662\u7684\u7814\u7a76\u4eba\u5458\u7684\u8bba\u6587\u8ba4\u4e3a\uff0c\u867d\u7136\u65af\u5766\u798f\u6a21\u578b\u5bf9\u4e8e\u5b9e\u73b0\u9ad8\u94fe\u8def\u5229\u7528\u7387\u662f\u6709\u6548\u7684\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5b83\u53ef\u80fd\u5bfc\u81f4\u4e25\u91cd\u7684\u62a5\u6587\u4e22\u5931\uff08\u5728\u6a21\u62df\u4e2d\u4e3a5-15%\uff09\u3002\u4ed6\u4eec\u8ba4\u4e3a\uff0c\u8fd9\u79cd\u6570\u91cf\u7684\u62a5\u6587\u4e22\u5931\u4f1a\u5bfc\u81f4\u9ad8\u6c34\u5e73\u7684\u91cd\u65b0\u4f20\u8f93\u548c\u964d\u4f4e\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u3002\u4ed6\u4eec\u7684\u5f15\u5165\u4e86\u51e0\u4e2a\u65b0\u6982\u5ff5\u3002\u9996\u5148\uff0c\u5b83\u5efa\u8bae\u5c06\u94fe\u63a5\u5f52\u7c7b\u4e3a\u5b83\u4eec\u662f\u5426&#8221;\u53ef\u6ee1\u8db3&#8221;\u3002\u5373\u4f7f\u6ca1\u6709\u8fdb\u4e00\u6b65\u7684\u7814\u7a76\uff0c\u8fd9\u4e2a\u6982\u5ff5\u5bf9\u4e8e\u7f13\u5b58\u8bbe\u8ba1\u7684\u5b9e\u9645\u5e94\u7528\u4e5f\u5f88\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7279\u5b9a\u7684\u6570\u636e\u4e2d\u5fc3\u73af\u5883\u5141\u8bb8\u4ee5\u76f8\u5bf9\u8f83\u4f4e\u7684\u6210\u672c\u6dfb\u52a0\u5176\u4ed6\u94fe\u8def\uff0c\u5219\u53ef\u4ee5\u5c06\u7f13\u5b58\u9650\u5236\u5728\u901f\u5ea6\u5339\u914d\u548c\u5fae\u7a81\u53d1\u6240\u9700\u7684\u6c34\u5e73\uff0c\u56e0\u4e3a\u53ef\u4ee5\u907f\u514d\u6301\u7eed\u7684\u62e5\u585e\u3002\u5728\u53e6\u4e00\u4e2a\u6781\u7aef\uff0cDSL\uff0c\u6216&#8221;\u6700\u540e\u4e00\u516c\u91cc&#8221;\u53ef\u80fd\u4f1a\u9047\u5230\u4e25\u91cd\u7684\u6301\u7eed\u62e5\u585e\u3002\u4ed6\u4eec\u7684\u7814\u7a76\u4e0e\u65af\u5766\u798f\u6a21\u578b\u4e00\u81f4\uff0c\u5373&#8221;\u5c0f&#8221;\u7f13\u5b58\u8db3\u4ee5\u7528\u4e8e\u9aa8\u5e72\u94fe\u63a5\uff0c\u4f46\u51fa\u4e8e\u4e0d\u540c\u7684\u539f\u56e0\uff1a\u6839\u636e\u5f53\u524d\u7684\u670d\u52a1\u63d0\u4f9b\u5546\u90e8\u7f72\u5b9e\u8df5\uff0c\u5b83\u4eec\u65e0\u6cd5\u6ee1\u8db3\u3002<\/p>\n\n\n\n<p>\u4f50\u6cbb\u4e9a\u7406\u5de5\u5b66\u9662\u7684\u7814\u7a76\u8fd8\u6307\u51fa\uff0c\u4efb\u4f55\u57fa\u4e8eTCP\u6d41\u6570\u91cf\u7684\u7ed3\u8bba\u90fd\u5fc5\u987b\u5c06\u6d41\u7684\u8ba1\u6570\u9650\u5236\u4e3a\u957fTCP\u6d41\uff0c\u8fd9\u4e9b\u6d41\u5728\u5176\u4ed6\u94fe\u8def\u4e0a\u6ca1\u6709\u74f6\u9888\uff0c\u4e5f\u4e0d\u4f1a\u53d7\u5230\u6700\u7ec8\u4e3b\u673a\u7a97\u53e3\u6216\u8fde\u63a5\u901f\u5ea6\u7684\u74f6\u9888\u3002\u4ed6\u4eec\u8fd8\u63d0\u51fa\u4e86\u4e00\u4e9b\u8ba1\u7b97\u7ed3\u679c\uff0c\u5176\u4e2d\u8868\u660e\uff0c\u5728\u65af\u5766\u798f\u6a21\u578b\u4e2d\uff0c\u635f\u5931\u7387\u968f\u7740\u8be5\u94fe\u8def\u4e0a\u74f6\u9888\u7684\u6d41\u91cf\u6570\u91cf\u7684\u5e73\u65b9\u800c\u589e\u52a0\u3002<\/p>\n\n\n\n<p>\u65af\u5766\u798f\u5927\u5b662006\u5e74\u7684\u4e00\u7bc7\u8bba\u6587\u8ba8\u8bba\u4e86\u4f50\u6cbb\u4e9a\u7406\u5de5\u5b66\u9662\u7684\u53d1\u73b0\uff0c\u5e76\u63d0\u51fa\u4e86\u4e00\u79cd\u6838\u5fc3\u94fe\u63a5\u7684\u542f\u53d1\u5f0f\u65b9\u6cd5\u3002\u4ed6\u4eec\u8ba4\u4e3a\uff1a&#8221;\u5728\u4e92\u8054\u7f51\u7684\u6838\u5fc3\uff0c\u6d41\u91cf\u6570\u91cf\u975e\u5e38\u5927\uff0c\u7f13\u5b58\u53ef\u4ee5\u51cf\u5c11\u5341\u500d\uff0c\u800c\u4e0d\u4f1a\u671f\u671b\u5bf9\u7f51\u7edc\u884c\u4e3a\u4ea7\u751f\u4efb\u4f55\u4e0d\u5229\u53d8\u5316\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u9884\u8ba1\u5ef6\u8fdf\u548c\u5ef6\u8fdf\u53d8\u5316\u4f1a\u51cf\u5c11\u3002<\/p>\n\n\n\n<p>\u4e92\u8054\u7f51RTT\u4e3a250\u6beb\u79d2\uff0c\u8fd9\u4e2a&#8221;\u5341\u500d&#8221;\u4e3a\u670d\u52a1\u4e8e\u5168\u7403\u4e92\u8054\u7f51\u6838\u5fc3\u7684\u8def\u7531\u5668\u4f1a\u4ea7\u751f25\u6beb\u79d2\u7684\u7f13\u5b58\u3002\u4e3b\u8981\u670d\u52a1\u4e8e\u533a\u57df\u5185\u6d41\u91cf\u7684\u7f51\u7edc\u5c06\u9700\u8981\u6309\u6bd4\u4f8b\u7f29\u5c0f\u7684\u7f13\u5b58\u3002<\/p>\n\n\n\n<p>\u5b66\u672f\u754c\u6709\u8fd9\u6837\u4e00\u79cd\u89c2\u70b9\uff0c\u5373\u7f13\u5b58\u9700\u6c42\u53d6\u51b3\u4e8e\u8bb8\u591a\u56e0\u7d20\uff0c\u5305\u62ec\u671f\u671b\u7684\u7ed3\u679c\uff08\u4f8b\u5982\uff0c\u4fdd\u6301\u94fe\u8def\u5145\u5206\u5229\u7528\uff0c\u9650\u5236\u635f\u5931\u6216\u6700\u5927\u5316\u6bcf\u6d41\u91cf\u541e\u5410\u91cf\uff09\uff0c\u8d85\u989d\u5b9a\u8d2d\u548c\u62e5\u585e\u7684\u6c34\u5e73\uff0c\u6d41\u91cf\u7684\u6570\u91cf\uff0c\u7c7b\u578b\u548c\u540c\u6b65\u3002\u8fd9\u662f\u5728\u8003\u8651\u5e94\u7528\u7a0b\u5e8f\u5bf9\u4e22\u5931\u3001\u5ef6\u8fdf\u548c\u6296\u52a8\u7684\u654f\u611f\u6027\u4e4b\u524d\u3002\u867d\u7136\u8fd9\u9879\u7814\u7a76\u6ca1\u6709\u63d0\u4f9b\u5355\u4e00\u7684\u7b54\u6848\uff0c\u4f46\u5b83\u5f00\u8f9f\u4e86\u4e00\u4e9b\u65b0\u7684\u65b9\u6cd5\u6765\u770b\u5f85\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e76\u5728\u5b83\u4eec\u5728\u7f51\u7edc\u4e2d\u7684\u4f4d\u7f6e\u6765\u8bc4\u4f30\u66ff\u4ee3\u65b9\u6848\u3002\u5173\u4e8e\u8fb9\u7f18\u548c\u8bbf\u95ee\u7f13\u5b58\u5927\u5c0f\u7684\u7814\u7a76\u8f83\u5c11\uff0c\u4f46\u53ef\u7528\u7684\u5185\u5bb9\u5f80\u5f80\u652f\u6301\u8fd9\u6837\u4e00\u79cd\u89c2\u70b9\uff0c\u5373\u5728\u5355\u4e2a\u6d41\u53ef\u4ee5\u5360\u7528\u94fe\u8def\u6240\u6709\u5e26\u5bbd\u7684\u4f4d\u7f6e\uff0c\u8be5\u94fe\u8def\u53ef\u80fd\u9700\u8981BDP\u5927\u5c0f\u8c03\u6574\u3002\u5982\u679c\u5171\u4eab\u7f13\u5b58\uff0c\u5219\u805a\u5408\u7f13\u5b58\u53ef\u80fd\u4f1a\u51cf\u5c11\u3002<\/p>\n\n\n\n<p><strong>\u5176\u4ed6\u7814\u7a76\u89c2\u70b9<\/strong><\/p>\n\n\n\n<p>\u8bb8\u591a\u7814\u7a76\u6a21\u578b\u4f9d\u8d56\u4e8e\u62a5\u6587\u5230\u8fbe\u6cca\u677e\u5206\u5e03\u7684\u5047\u8bbe\uff08\u5230\u8fbe\u65f6\u95f4\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u62a5\u6587\uff09\u3002\u6709\u8bba\u6587\u8ba4\u4e3a\u901a\u8fc7ACK\u7684\u6b65\u8c03\u4f1a\u4ea7\u751f\u7ad9\u7acb\u961f\u5217\u548c\u975e\u6cca\u677e\u62a5\u6587\u5230\u8fbe\u3002\u53e6\u4f46\u73b0\u5b9e\u662f\uff0c\u4e1a\u52a1\u8003\u8651\u56e0\u7d20\u53ef\u80fd\u4f1a\u538b\u5012\u5bf9\u7406\u60f3\u8bbe\u8ba1\u7684\u6e34\u671b\u3002\u4e0e\u5177\u6709\u66f4\u6df1\u7247\u5916\u7f13\u5b58\u7684\u8def\u7531\u5668\u76f8\u6bd4\uff0c\u5177\u6709\u5c0f\u578b\u7247\u4e0a\u7f13\u5b58\u7684\u8def\u7531\u5668\u7684\u5bc6\u5ea6\u8981\u9ad8\u5f97\u591a\uff0c\u6210\u672c\u8981\u4f4e\u5f97\u591a\uff0c\u5e76\u4e14\u529f\u8017\u4e5f\u66f4\u4f4e\u3002<\/p>\n\n\n\n<p><strong>\u771f\u5b9e\u5e94\u7528\u4e2d\u7684\u7f13\u5b58\u7814\u7a76<\/strong><\/p>\n\n\n\n<p><strong>Facebook \u2013&nbsp;\u94fe\u63a5\u548c\u7f13\u5b58\u5229\u7528\u7387<\/strong><\/p>\n\n\n\n<p>\u7814\u7a76\u4eba\u5458\u5bf9Facebook\u7684\u6d41\u91cf\u8fdb\u884c\u4e86\u6df1\u5165\u5206\u6790\uff0c\u4ed6\u4eec\u7684\u8bba\u6587\u5305\u62ec\u4e00\u7cfb\u5217\u53d1\u73b0\uff0c\u5176\u4e2d\u8bb8\u591a\u4e0e\u7f13\u5b58\u8bbe\u8ba1\u6709\u5173\u3002\u670d\u52a1\u5668\u8fde\u63a5\u4e8610G\uff0c\u5e73\u5747\u4e0d\u52301%\u76841\u5206\u949f\u94fe\u8def\u5229\u7528\u7387\uff0c90%\u7684\u5229\u7528\u7387\u4f4e\u4e8e10%\u3002Hadoop\u6d41\u91cf\u8868\u73b0\u51fa\u6781\u9ad8\u7684\u673a\u67b6\u5c40\u90e8\u6027 &#8211; \u5927\u90e8\u5206\u6d41\u91cf\u4f4d\u4e8e\u540c\u4e00\u673a\u67b6\u4e2d\u7684\u4e3b\u7ad9\u548c\u4ece\u7ad9\u4e4b\u95f4\u3002Hadoop\u6d41\u7a0b\u5f88\u77ed\u300270%\u53d1\u9001\u7684\u5bb9\u91cf\u5c0f\u4e8e10KB\uff0c\u6301\u7eed\u65f6\u95f4\u4e0d\u523010\u79d2\u3002Hadoop\u6d41\u7684\u4e2d\u4f4d\u6570\u5c0f\u4e8e1KB\u548c1\u79d2\uff0c\u56e0\u6b64\u4e0d\u4f1a\u8fdb\u5165\u62e5\u585e\u907f\u514d\u72b6\u6001\u3002\u53ea\u67095%\u8d85\u8fc71MB\u3002\u6709\u5173\u7f13\u5b58\u5229\u7528\u7387\u7684\u6570\u636e\u4ee510 usec\u7684\u95f4\u9694\u8fdb\u884c\u6536\u96c6\uff0c\u7528\u4e8e\u94fe\u63a5\u5230Web\u670d\u52a1\u5668\u548c\u7f13\u5b58\u8282\u70b9\u3002\u5373\u4f7f\u603b\u5229\u7528\u7387\u8f83\u4f4e\uff0c\u7f13\u5b58\u4e5f\u7ecf\u5e38\u5728ToR\u4ea4\u6362\u673a\u4e0a\u4f7f\u7528\u3002\u5c3d\u7ba1\u94fe\u8def\u5229\u7528\u7387\u5728\u5927\u591a\u6570\u65f6\u95f4\u5185\u7ea6\u4e3a1%\uff0c\u4f46\u5728\u6bcf\u4e2a10us\u95f4\u9694\u5185\uff0c\u8d85\u8fc7\u4e09\u5206\u4e4b\u4e8c\u7684\u53ef\u7528\u5171\u4eab\u7f13\u5b58\u88ab\u4f7f\u7528\u3002<\/p>\n\n\n\n<p><strong>\u8c37\u6b4c \u2013 \u521d\u59cb\u62e5\u585e\u7a97\u53e3<\/strong><\/p>\n\n\n\n<p>\u8c37\u6b4c\u7814\u7a76\u5c06TCP\u521d\u59cb\u62e5\u585e\u7a97\u53e3\u589e\u52a0\u523010\u4e2a\u6216\u66f4\u9ad8\u7684\u6bb5\u7684\u6548\u679c\u3002\u5728\u4e00\u4e2aRTT\u5185\u53ef\u4ee5\u5b8c\u6210\u7684\u7f51\u7edc\u4ea4\u6613\u6570\u91cf\u5927\u5e45\u589e\u52a0\uff0c\u5b8c\u6210\u65f6\u95f4\u4e5f\u76f8\u5e94\u51cf\u5c11\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u79cd\u53d8\u5316\u7684\u8d1f\u9762\u5f71\u54cd\u662f\u6709\u9650\u7684\uff0c\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002\u8fd9\u79cd\u65b9\u6cd5\u4f5c\u4e3a\u6253\u5f00\u5927\u91cf\u5e76\u884cTCP\u8fde\u63a5\u7684\u66ff\u4ee3\u65b9\u6848\u3002\u8bb8\u591a\u5927\u578b\u7f51\u7ad9\u73b0\u5728\u6b63\u5728\u91c7\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u5176\u4e2d60%\u7684\u521d\u59cb\u62e5\u5835\u7a97\u53e3\u572810\u523016\u4e2a\u6bb5\u4e4b\u95f4\u3002TCP\u7684\u8fd9\u79cd\u6f14\u53d8\u786e\u5b9e\u8868\u660e\uff0c\u5373\u4f7f\u6d41\u91cf\u672c\u8eab\u6ca1\u6709\uff0c\u6d41\u91cf\u7684\u57fa\u672c\u6d41\u884c\u4e3a\u4e5f\u53ef\u80fd\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u6539\u53d8\uff0c\u5e76\u4e14\u63d0\u4f9b\u4e86\u5728\u9009\u62e9\u786c\u4ef6\u65f6\u5141\u8bb8\u4e00\u4e9b\u66f4\u6539\u7a7a\u95f4\u7684\u52a8\u673a\uff0c\u7279\u522b\u662f\u5728\u6d41\u5411\u6d41\u6570\u91cf\u8f83\u5c11\u7684\u7f51\u7edc\u7684\u8fb9\u7f18\u548c\u8bbf\u95ee\u5c42\u3002<\/p>\n\n\n\n<p>\u81ea\u4ece\u65af\u5766\u798f\u5927\u5b66\u548c\u4f50\u6cbb\u4e9a\u7406\u5de5\u5b66\u9662\u7684\u7f13\u5b58\u7814\u7a76\u548c\u5b9e\u9a8c\u4ee5\u6765\uff0c\u521d\u59cb\u62e5\u5835\u7a97\u53e3\u7684\u6f14\u53d8\u9700\u8981\u5728\u4eca\u5929\u5e94\u7528\u7ed3\u8bba\u65f6\u52a0\u4ee5\u8003\u8651\u3002\u4e4b\u524d\u5e38\u89c1\u7684TCP\u5806\u6808\u4f7f\u75282-4\u4e2a\u6bb5\u7684\u521d\u59cb\u7a97\u53e3\uff08RFC 3390\uff09\u30022010\u5e74\uff0c\u8c37\u6b4c\u63d0\u51fa\u4e8610\u4e2a\u521d\u59cb\u7a97\u53e3\uff0c\u5e76\u5df2\u88ab\u5e7f\u6cdb\u91c7\u7528\u3002\u7531\u4e8e\u62e5\u585e\u7b97\u6cd5\u548c\u8bbe\u7f6e\u5bf9\u4e8e\u6bcf\u4e2a\u53d1\u9001\u7aef\u90fd\u662f\u72ec\u7acb\u7684\uff0c\u5e76\u4e14\u5927\u591a\u6570\u6d41\u91cf\u90fd\u662f\u670d\u52a1\u5668\u5230\u5ba2\u6237\u7aef\u7684\uff0c\u56e0\u6b64\u53ea\u9700\u8981\u5c11\u6570\u9876\u7ea7\u63d0\u4f9b\u5546\u91c7\u7528\u6b64\u66f4\u6539\u5373\u53ef\u663e\u8457\u66f4\u6539Internet\u4e0a\u7684\u805a\u5408TCP\u884c\u4e3a\u3002<\/p>\n\n\n\n<p><strong>\u9ad8\u9891\u4ea4\u6613<\/strong><\/p>\n\n\n\n<p>\u9ad8\u9891\u4ea4\u6613\uff08HFT\uff09\u662f\u4e00\u4e2a\u4f17\u6240\u5468\u77e5\u7684\u5ef6\u8fdf\u548cPDV\u654f\u611f\u578b\u5e94\u7528\u7a0b\u5e8f\u3002\u91d1\u878d\u670d\u52a1\u63d0\u4f9b\u5546\u4e3a\u4e86\u8282\u7701\u51e0\u6beb\u79d2\u7684\u4f20\u64ad\u5ef6\u8fdf\uff0c\u5c31\u53ef\u4ee5\u6295\u5165\u5f88\u591a\u8d44\u91d1\u6539\u9020\u5149\u7ea4\u7ebf\u8def\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5fc5\u987b\u6d88\u9664\u6240\u6709\u53ef\u80fd\u7684\u8bbe\u5907\u6807\u51c6\u5ef6\u8fdf\uff0c\u5e76\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u7f13\u5b58\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u5185\u5b58\u64cd\u4f5c\u7684\u6570\u91cf\u548c\u4f7f\u7528\u76f4\u901a\u5207\u6362\u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p><strong>\u6e38\u620f<\/strong><\/p>\n\n\n\n<p>\u6e38\u620f\u5305\u62ec\u4e00\u7cfb\u5217\u5177\u6709\u4e0d\u540c\u8981\u6c42\u7684\u5e94\u7528\u3002\u5176\u4e2d\u8bb8\u591a\u5177\u6709\u5ef6\u8fdf\u7ea6\u675f\uff0c\u907f\u514d\u9ad8\u5ef6\u8fdf\u800c\u4e0d\u662f\u6700\u5c0f\u5316\u5ef6\u8fdf\u6700\u4e3a\u91cd\u8981\u3002\u6b64\u5916\uff0c\u8d22\u52a1\u9a71\u52a8\u56e0\u7d20\u662f\u4e0d\u540c\u7684\uff0cISP\u63d0\u4f9b\u7684\u6e38\u620f\u4f18\u5316\u670d\u52a1\u4ea7\u54c1\u4e5f\u5f88\u5c11\u3002\u66f4\u591a\u7684\u5e26\u5bbd\uff0c\u652f\u6301QoS\u7684\u5bb6\u7528\u8def\u7531\u5668\uff0c\u4ee5\u53ca\u964d\u4f4e\u5176\u4ed6\u5927\u6d41\u91cf\u5e94\u7528\u901a\u5e38\u662f\u6700\u7ec8\u7528\u6237\u6539\u5584\u6e38\u620f\u4f53\u9a8c\u7684\u552f\u4e00\u9009\u62e9\u3002<\/p>\n\n\n\n<p>\u6e38\u620f\u8bbe\u7f6e\u548c\u804a\u5929\u4e3b\u8981\u4f7f\u7528TCP\u6267\u884c\uff0c\u6ca1\u6709\u4e25\u683c\u7684\u5ef6\u8fdf\u8981\u6c42\u3002\u6e38\u620f\u73a9\u6cd5\u901a\u5e38\u901a\u8fc7UDP\u8fdb\u884c\u64cd\u4f5c\u3002\u6e38\u620f\u73a9\u6cd5\u8981\u6c42\u53d6\u51b3\u4e8e\u6e38\u620f\u7c7b\u578b\uff08\u4f8b\u5982\uff0c\u7b2c\u4e00\u4eba\u79f0\u5c04\u51fb\u6e38\u620f\u6216\u5b9e\u65f6\u6218\u7565\uff09\u4ee5\u53ca\u53d6\u51b3\u4e8e\u5176\u4ed6\u73a9\u5bb6\u4f4d\u7f6e\u7684\u4e2a\u4eba\u52a8\u4f5c\u6240\u9700\u7684\u7cbe\u5ea6\u3002\u5927\u591a\u6570\u5728\u7ebf\u6e38\u620f\u7684\u5e26\u5bbd\u8981\u6c42\u76f8\u5bf9\u8f83\u4f4e\uff0810 kbps\uff09\uff0c\u5e76\u4e14\u5bb9\u5fcd\u5ef6\u8fdf\u7ea6\u4e3a150-200\u6beb\u79d2\u3002\u5f80\u8fd4\u5ef6\u8fdf\u5728\u6e38\u620f\u5708\u4e2d\u79f0\u4e3a&#8221;ping&#8221;\uff0c\u901a\u5e38\u5728\u9009\u62e9\u6f5c\u5728\u5bf9\u624b\u65f6\u663e\u793a\u3002\u5927\u591a\u6570\u6e38\u620f\u90fd\u6709\u901a\u8fc7\u5141\u8bb8\u5ba2\u6237\u7aef\u9884\u6d4b\u5176\u64cd\u4f5c\u7684\u7ed3\u679c\u6765\u63a9\u76d6\u5ef6\u8fdf\u5230\u6b64\u7ea7\u522b\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u89d2\u8272\u53ef\u4ee5\u5728\u64ad\u653e\u58f0\u97f3\u65f6\u79fb\u52a8\u5e76\u663e\u793a\u52a8\u753b\u3002\u5982\u679c\u670d\u52a1\u5668\u7a0d\u540e\u5bf9\u6e38\u620f\u72b6\u6001\u5b58\u5728\u5206\u6b67\uff0c\u5219\u4f1a\u5bf9\u72b6\u6001\u8fdb\u884c\u66f4\u6b63\u3002\u5982\u679c\u9700\u8981\u66f4\u6b63\uff0c\u5ba2\u6237\u7aef\u5c06\u91cd\u65b0\u8fd0\u884c\u66f4\u6b63\u540e\u53d1\u751f\u7684\u6240\u6709\u5185\u5bb9\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5ba2\u6237\u7aef\u770b\u5230\u7684\u6e38\u620f\u4e2d\u7684&#8221;\u8df3\u8dc3&#8221;\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u6269\u5c55\u548c\u7ba1\u7406\u5ef6\u8fdf\uff0c\u4e3b\u8981\u6e38\u620f\u5c06\u5177\u6709\u6309\u5730\u7406\u4f4d\u7f6e\u5206\u5e03\u7684\u670d\u52a1\u5668\u96c6\uff0c\u56e0\u4e3a\u5355\u4e2a\u6258\u7ba1\u4f4d\u7f6e\u65e0\u6cd5\u6ee1\u8db3\u6bcf\u4e2a\u4eba\u7684\u8fd9\u4e9b\u8981\u6c42\u3002\u4f8b\u5982\uff0c\u66b4\u96ea\u5728\u7f8e\u56fd\u3001\u6b27\u6d32\u548c\u4e9a\u6d32\u90fd\u6709\u670d\u52a1\u7ad9\u70b9\uff0c\u8fd9\u4e9b\u7ad9\u70b9\u6258\u7ba1\u7740\u300a\u9b54\u517d\u4e16\u754c\u300b\u3001\u300a\u98ce\u66b4\u82f1\u96c4\u300b\u548c\u300a\u661f\u9645\u4e89\u9738\u300b\u3002\u8fd9\u4ecd\u7136\u4e0d\u5141\u8bb8\u592a\u591a\u7684\u7f13\u5b58\uff0c\u56e0\u4e3a\u5728\u4e9a\u6d32\u6216\u5357\u7f8e\u548c\u7f8e\u56fd\u4e4b\u95f4\uff0c\u672a\u62e5\u5835\u7684ping\u53ef\u80fd\u4f1a\u8fbe\u5230150\u6beb\u79d2\u3002\u5728\u7f8e\u56fd\u548c\u6b27\u6d32\uff0c\u672a\u62e5\u585e\u7684\u5ef6\u8fdf\u5927\u591a\u4f4e\u4e8e100 \u6beb\u79d2\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u5355\u4e2a\u6d41\uff0c\u6e38\u620f\u4e0d\u592a\u53ef\u80fd\u53d7\u76ca\u4e8e\u8d85\u8fc750\u6beb\u79d2\u7684\u6574\u4f53\u7f13\u5b58\u3002<\/p>\n\n\n\n<p>&lt;\u672a\u5b8c\u5f85\u7eed&gt;<\/p>\n\n\n\n<p>\u5e0c\u671b\u672c\u6587\u80fd\u5bf9\u4e86\u89e3\u6570\u901a\u7f51\u7edc\u8bbe\u5907\u63d0\u4f9b\u4e00\u70b9\u7c97\u6d45\u7684\u611f\u6027\u8ba4\u8bc6\u3002<br>\u672c\u6587\u6709\u5173\u4fe1\u606f\u5747\u6765\u81ea\u516c\u5f00\u8d44\u6599\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00\u4e0d\u540c\u65f6\u4ee3\u7684\u6570\u901a\u7f51\u7edc\u6280\u672f\uff0c\u90fd\u6709\u7740\u5176\u5f53\u65f6 [&hellip;]<\/p>","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[7],"tags":[],"class_list":["post-1363","post","type-post","status-publish","format-standard","hentry","category-techblog"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"liujun","author_link":"https:\/\/www.zenosic.com\/en\/author\/liujun\/"},"uagb_comment_info":0,"uagb_excerpt":"\u524d\u8a00\u4e0d\u540c\u65f6\u4ee3\u7684\u6570\u901a\u7f51\u7edc\u6280\u672f\uff0c\u90fd\u6709\u7740\u5176\u5f53\u65f6 [&hellip;]","_links":{"self":[{"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/posts\/1363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/comments?post=1363"}],"version-history":[{"count":1,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/posts\/1363\/revisions"}],"predecessor-version":[{"id":1364,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/posts\/1363\/revisions\/1364"}],"wp:attachment":[{"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/media?parent=1363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/categories?post=1363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zenosic.com\/en\/wp-json\/wp\/v2\/tags?post=1363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}