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class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wds-service-1258344699.file.myqcloud.com\/20\/12706\/webp\/16590138749132ec148eef4e7b407.webp\" alt=\"1b541f585d29da7e_html_1bd9a04640eaaf99\"\/><\/figure>\n\n\n\n<p>\u62e5\u585e\u7a97\u53e3\u8fbe\u5230\u79f0\u4e3a\u6162\u542f\u52a8\u9608\u503c\u7684\u7279\u5b9a\u5927\u5c0f\u540e\uff0c\u4f1a\u8bdd\u5c06\u4ece\u6162\u542f\u52a8\u6a21\u5f0f\u8f6c\u6362\u4e3a\u907f\u514d\u62e5\u585e\u6a21\u5f0f\u3002\u6162\u542f\u52a8\u9608\u503c\u6700\u521d\u8bbe\u7f6e\u4e3a\u8f83\u9ad8\u7ea7\u522b\u3002\u4e00\u65e6\u8fdb\u5165\u62e5\u585e\u907f\u514d\u6a21\u5f0f\uff0c\u62e5\u585e\u7a97\u53e3\u5c06\u7ebf\u6027\u589e\u52a0\uff0c\u800c\u4e0d\u662f\u5448\u6307\u6570\u7ea7\u589e\u957f-\u6bcf\u4e2aRTT\u53ea\u6709\u4e00\u4e2a\u533a\u6bb5\u3002\u5728Tahoe\u4e2d\uff0c\u5982\u679c\u68c0\u6d4b\u5230\u4efb\u4f55\u62a5\u6587\u4e22\u5931\uff0c\u4f1a\u8bdd\u5c06\u6062\u590d\u4e3a\u6162\u542f\u52a8\uff0c\u5e76\u4e14\u6162\u542f\u52a8\u9608\u503c\u5c06\u91cd\u7f6e\u4e3a\u68c0\u6d4b\u5230\u4e22\u5931\u65f6\u62e5\u585e\u7a97\u53e3\u7684\u4e00\u534a\u3002\u8fd9\u610f\u5473\u7740\u4f1a\u8bdd\u5c06\u5728\u4e0b\u4e00\u4e2a\u659c\u5761\u4e0a\u4ee5\u8f83\u5c0f\u7684\u7a97\u53e3\u5927\u5c0f\u8fdb\u5165&#8221;\u907f\u514d\u62e5\u585e&#8221;\u3002\u6b64\u673a\u5236\uff08\u5c06\u62e5\u585e\u7a97\u53e3\u51cf\u534a\uff09\u7684\u7ed3\u679c\u662f\uff0c\u6301\u7eed\u62e5\u585e\u53ef\u80fd\u5bfc\u81f4\u62e5\u585e\u7a97\u53e3\u5927\u5c0f\u5448\u6307\u6570\u7ea7\u4e0b\u964d\uff0c\u5e76\u964d\u4f4e\u542f\u52a8\u901f\u5ea6\u9608\u503c\uff0c\u4ece\u800c\u663e\u8457\u5f71\u54cd\u4f1a\u8bdd\u6027\u80fd\u3002<\/p>\n\n\n\n<p>TCP\u62e5\u585e\u63a7\u5236\u7684\u53e6\u4e00\u4e2a\u65b9\u9762\u662f\u786e\u5b9a\u5728\u58f0\u660e\u7531\u4e8e\u62a5\u6587\u6216\u5176ACK\u88ab\u4e22\u5f03\u6216\u635f\u574f\u800c\u4e22\u5931\u6bb5\u4e4b\u524d\u8981\u7b49\u5f85\u591a\u957f\u65f6\u95f4\u3002\u6b64\u503c\u79f0\u4e3a\u63a5\u6536\u8d85\u65f6\uff08RTO\uff09\uff08RFC6298\uff0cRFC1122\uff09\u3002\u5c06RTO\u8bbe\u7f6e\u5f97\u592a\u4f4e\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u4f20\u8f93\u3002\u5c06\u5176\u8bbe\u7f6e\u5f97\u592a\u9ad8\u5c06\u5bfc\u81f4\u5bf9\u6d41\u91cf\u635f\u5931\u7684\u68c0\u6d4b\u901f\u5ea6\u53d8\u6162\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u7f51\u7edc\u6761\u4ef6\u7684\u53d8\u5316\uff08\u4f8b\u5982\uff0c\u8def\u7531\u8def\u5f84\u66f4\u6539\u6216\u62e5\u585e\uff09\uff0cRTO\u65e0\u6cd5\u8bbe\u7f6e\u4e3a\u6700\u4f73\u60c5\u51b5\uff0c\u751a\u81f3\u65e0\u6cd5\u8bbe\u7f6e\u4e3a\u5e73\u5747\u5f80\u8fd4\u65f6\u95f4\u3002\u800c\u662f\u8ba1\u7b97\u5e73\u6ed1\u7684RTT\u548cRTT\u65b9\u5dee\u3002RTO\u8bbe\u7f6e\u4e3a\u5e73\u6ed1\u7684RTT+4\u500d\u53d8\u5316\u62161\u79d2\uff0c\u4ee5\u8f83\u5927\u8005\u4e3a\u51c6\u3002<\/p>\n\n\n\n<p>\u6709\u5173\u91cd\u65b0\u4f20\u8f93\u8d85\u65f6\u7684\u6df1\u5165\u4ecb\u7ecd\uff0c\u53ef\u53c2\u8003RFC6298\u3002\u5728Tahoe\u4e2d\uff0cRTO\u672a\u8bbe\u7f6e\u4e3a\u4f4e\u4e8e1\u79d2\uff0c\u56e0\u6b64\u901a\u8fc7RTO\u68c0\u6d4b\u7f51\u7edc\u62e5\u585e\u53ef\u80fd\u9700\u8981\u76f8\u5bf9\u8f83\u957f\u7684\u65f6\u95f4\uff0c\u5c24\u5176\u662f\u5728\u4f4eRTT\u6761\u4ef6\u4e0b\u3002TCP\u7684\u540e\u671f\u53d1\u5c55\u89e3\u51b3\u4e86Tahoe\u7684\u8fd9\u4e00\u70b9\u548c\u5176\u4ed6\u9650\u5236\u3002<\/p>\n\n\n\n<p>\u4e0b\u56fe\u663e\u793a\u4e86\u6162\u542f\u52a8\u3001\u62e5\u585e\u907f\u514d\u548cRTO\u4e8b\u4ef6\u4e4b\u540e\u7684\u62e5\u585e\u7a97\u53e3\u5927\u5c0f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/wds-service-1258344699.file.myqcloud.com\/20\/12706\/webp\/1659013875303bb6cc1d9eefd4cda.webp\" alt=\"1b541f585d29da7e_html_b8356bba7fe6ecb8\"\/><\/figure>\n\n\n\n<p>\u4f5c\u4e3a\u786e\u8ba4\u8fc7\u7a0b\u7684\u4e00\u90e8\u5206\uff0cTCP\u4f1a\u5728\u53d1\u9001\u65b9\u7684TCP\u5806\u6808\u65e0\u5e8f\u63a5\u6536\u5206\u6bb5\u65f6\u9690\u5f0f\u901a\u77e5\u53d1\u9001\u7aef\u7684TCP\u5806\u6808\u3002\u5f53\u6536\u5230\u540c\u4e00\u6bb5\u7684\u591a\u4e2aACK\u65f6\uff0c\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\u3002\u63a5\u6536\u7aef\u6b63\u5728\u901a\u77e5\u6536\u5230\u4e86\u4e00\u4e2a\u65b0\u6bb5\uff0c\u4f46\u4ecd\u7136\u53ea\u80fd\u786e\u8ba4\u524d\u4e00\u4e2a\u6bb5\uff0c\u56e0\u4e3a\u5b58\u5728\u95f4\u9699\u3002\u8fd9\u53ef\u4ee5\u5b9e\u73b0\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u3002\u4f8b\u5982\uff0c\u5982\u679c\u63a5\u6536\u65b9\u5177\u6709\u6bb50-550\u5e76\u4e14\u63a5\u6536552\u548c553\uff0c\u5219551\u53ef\u80fd\u5df2\u4e22\u5931\u3002\u63a5\u6536\u7aef\u5c06\u4e3a\u5728\u6b64\u65b9\u6848\u4e2d\u63a5\u6536\u7684\u6bcf\u4e2a\u540e\u7eed\u6bb5\u53d1\u9001\u91cd\u590d\u7684ACK\u3002\u8fd9\u662f\u7f3a\u53e3\uff08550\uff09\u4e4b\u524d\u6700\u540e\u4e00\u6bb5\u7684\u9644\u52a0ACK\u3002\u6b64\u4fe1\u606f\u5141\u8bb8\u53d1\u4ef6\u4eba\u6bd4\u7b49\u5f85\u8d85\u65f6\u66f4\u5feb\u5730\u91cd\u65b0\u4f20\u8f93\u3002\u4f20\u7edf\u4e0a\uff0c\u5feb\u901f\u91cd\u65b0\u4f20\u8f93\u4f1a\u57283\u4e2a\u91cd\u590d\u7684ACK\u540e\u89e6\u53d1\u91cd\u65b0\u4f20\u8f93\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4e00\u4e2a\u9650\u5236\u4f1a\u5728\u540e\u7eed\u7684\u7b97\u6cd5\u4e2d\u89e3\u51b3\uff0c\u5373\u5b83\u4f9d\u8d56\u4e8e\u4e22\u5f03\u6bb5\u540e\u7684\u989d\u5916\u6d41\u91cf\u3002\u5728\u5c0f\u578bWeb\u6216\u5206\u5e03\u5f0f\u5904\u7406\u7684\u8001\u9f20\u6d41\u7279\u5f81\u4e2d\uff0c\u5bfc\u81f4DC\uff08\u4f8b\u5982Hadoop\uff09\u7684\u6d41\u5f88\u5c11\u89c1\uff0c\u6d41\u53ea\u6709\u51e0\u4e2aMSS\uff0c\u56e0\u6b64\u5728\u4e22\u5931\u7684\u6d41\u6bb5\u4e4b\u540e\u53ef\u80fd\u4e0d\u4f1a\u53d1\u90013\u4e2a\u989d\u5916\u7684\u6bb5\u3002\u6b64\u5916\uff0c\u6b64\u673a\u5236\u4e0d\u5141\u8bb8TCP\u8bc6\u522b\u591a\u4e2a\u6bb5\u4f55\u65f6\u4e22\u5931\u3002<\/p>\n\n\n\n<p>\u6700\u540e\uff0c\u5728\u5904\u4e8e\u975e\u6d3b\u52a8\u72b6\u6001\uff08\u5927\u81f4\u7b49\u4e8eRTO\uff09\u540e\uff0c\u4f1a\u8bdd\u5e94\u6062\u590d\u4e3a\u6162\u542f\u52a8\u72b6\u6001\u3002\u8fd9\u662f\u4e3a\u4e86\u9632\u6b62\u4f1a\u8bdd\u5c06\u6574\u4e2a\u5927\u578b\u62e5\u585e\u7a97\u53e3\u7684\u6d41\u91cf\u7a81\u53d1\u5230\u72b6\u6001\u53ef\u80fd\u5df2\u66f4\u6539\u7684\u7f51\u7edc\u4e2d\u3002<\/p>\n\n\n\n<p><strong>TCP Reno- 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