{"id":277,"date":"2022-05-31T14:48:04","date_gmt":"2022-05-31T06:48:04","guid":{"rendered":"http:\/\/blog.kijk.top\/?p=277"},"modified":"2022-05-31T14:48:04","modified_gmt":"2022-05-31T06:48:04","slug":"tcp-%e6%8b%a5%e5%a1%9e%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"http:\/\/blog.kijk.top\/?p=277","title":{"rendered":"TCP \u62e5\u585e\u63a7\u5236"},"content":{"rendered":"\n

\u8f6c\u8f7d\u4e8e\uff1ahttps:\/\/www.cnblogs.com\/xiaolincoding\/p\/12732052.html<\/p>\n\n\n\n

\u539f\u4f5c\u8005\u5199\u5f97\u5f88\u8be6\u7ec6\uff0c\u53d7\u76ca\u532a\u6d45\uff0c\u5728\u6b64\u7531\u8877\u611f\u8c22\uff01<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4e3a\u4ec0\u4e48\u8981\u6709\u62e5\u585e\u63a7\u5236\u5440\uff0c\u4e0d\u662f\u6709\u6d41\u91cf\u63a7\u5236\u4e86\u5417\uff1f<\/p><\/blockquote>\n\n\n\n

\u524d\u9762\u7684\u6d41\u91cf\u63a7\u5236\u662f\u907f\u514d\u300c\u53d1\u9001\u65b9\u300d\u7684\u6570\u636e\u586b\u6ee1\u300c\u63a5\u6536\u65b9\u300d\u7684\u7f13\u5b58\uff0c\u4f46\u662f\u5e76\u4e0d\u77e5\u9053\u7f51\u7edc\u7684\u4e2d\u53d1\u751f\u4e86\u4ec0\u4e48\u3002<\/p>\n\n\n\n

\u4e00\u822c\u6765\u8bf4\uff0c\u8ba1\u7b97\u673a\u7f51\u7edc\u90fd\u5904\u5728\u4e00\u4e2a\u5171\u4eab\u7684\u73af\u5883\u3002\u56e0\u6b64\u4e5f\u6709\u53ef\u80fd\u4f1a\u56e0\u4e3a\u5176\u4ed6\u4e3b\u673a\u4e4b\u95f4\u7684\u901a\u4fe1\u4f7f\u5f97\u7f51\u7edc\u62e5\u5835\u3002<\/p>\n\n\n\n

\u5728\u7f51\u7edc\u51fa\u73b0\u62e5\u5835\u65f6\uff0c\u5982\u679c\u7ee7\u7eed\u53d1\u9001\u5927\u91cf\u6570\u636e\u5305\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u5305\u65f6\u5ef6\u3001\u4e22\u5931\u7b49\uff0c\u8fd9\u65f6 TCP \u5c31\u4f1a\u91cd\u4f20\u6570\u636e\uff0c\u4f46\u662f\u4e00\u91cd\u4f20\u5c31\u4f1a\u5bfc\u81f4\u7f51\u7edc\u7684\u8d1f\u62c5\u66f4\u91cd\uff0c\u4e8e\u662f\u4f1a\u5bfc\u81f4\u66f4\u5927\u7684\u5ef6\u8fdf\u4ee5\u53ca\u66f4\u591a\u7684\u4e22\u5305\uff0c\u8fd9\u4e2a\u60c5\u51b5\u5c31\u4f1a\u8fdb\u5165\u6076\u6027\u5faa\u73af\u88ab\u4e0d\u65ad\u5730\u653e\u5927\u2026.<\/strong><\/p>\n\n\n\n

\u6240\u4ee5\uff0cTCP \u4e0d\u80fd\u5ffd\u7565\u7f51\u7edc\u4e0a\u53d1\u751f\u7684\u4e8b\uff0c\u5b83\u88ab\u8bbe\u8ba1\u6210\u4e00\u4e2a\u65e0\u79c1\u7684\u534f\u8bae\uff0c\u5f53\u7f51\u7edc\u53d1\u9001\u62e5\u585e\u65f6\uff0cTCP \u4f1a\u81ea\u6211\u727a\u7272\uff0c\u964d\u4f4e\u53d1\u9001\u7684\u6570\u636e\u91cf\u3002<\/p>\n\n\n\n

\u4e8e\u662f\uff0c\u5c31\u6709\u4e86\u62e5\u585e\u63a7\u5236<\/strong>\uff0c\u63a7\u5236\u7684\u76ee\u7684\u5c31\u662f\u907f\u514d\u300c\u53d1\u9001\u65b9\u300d\u7684\u6570\u636e\u586b\u6ee1\u6574\u4e2a\u7f51\u7edc\u3002<\/strong><\/p>\n\n\n\n

\u4e3a\u4e86\u5728\u300c\u53d1\u9001\u65b9\u300d\u8c03\u8282\u6240\u8981\u53d1\u9001\u6570\u636e\u7684\u91cf\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53eb\u505a\u300c\u62e5\u585e\u7a97\u53e3<\/strong>\u300d\u7684\u6982\u5ff5\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

\u4ec0\u4e48\u662f\u62e5\u585e\u7a97\u53e3\uff1f\u548c\u53d1\u9001\u7a97\u53e3\u6709\u4ec0\u4e48\u5173\u7cfb\u5462\uff1f<\/p><\/blockquote>\n\n\n\n

\u62e5\u585e\u7a97\u53e3 cwnd<\/strong>\u662f\u53d1\u9001\u65b9\u7ef4\u62a4\u7684\u4e00\u4e2a\u7684\u72b6\u6001\u53d8\u91cf\uff0c\u5b83\u4f1a\u6839\u636e\u7f51\u7edc\u7684\u62e5\u585e\u7a0b\u5ea6\u52a8\u6001\u53d8\u5316\u7684<\/strong>\u3002<\/p>\n\n\n\n

\u6211\u4eec\u5728\u524d\u9762\u63d0\u5230\u8fc7\u53d1\u9001\u7a97\u53e3 swnd<\/code> \u548c\u63a5\u6536\u7a97\u53e3 rwnd<\/code> \u662f\u7ea6\u7b49\u4e8e\u7684\u5173\u7cfb\uff0c\u90a3\u4e48\u7531\u4e8e\u52a0\u5165\u4e86\u62e5\u585e\u7a97\u53e3\u7684\u6982\u5ff5\u540e\uff0c\u6b64\u65f6\u53d1\u9001\u7a97\u53e3\u7684\u503c\u662fswnd = min(cwnd, rwnd)\uff0c\u4e5f\u5c31\u662f\u62e5\u585e\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u4e2d\u7684\u6700\u5c0f\u503c\u3002<\/p>\n\n\n\n

\u62e5\u585e\u7a97\u53e3 cwnd<\/code> \u53d8\u5316\u7684\u89c4\u5219\uff1a<\/p>\n\n\n\n

  • \u53ea\u8981\u7f51\u7edc\u4e2d\u6ca1\u6709\u51fa\u73b0\u62e5\u585e\uff0ccwnd<\/code> \u5c31\u4f1a\u589e\u5927\uff1b<\/li>
  • \u4f46\u7f51\u7edc\u4e2d\u51fa\u73b0\u4e86\u62e5\u585e\uff0ccwnd<\/code> \u5c31\u51cf\u5c11\uff1b<\/li><\/ul>\n\n\n\n

    <\/p>\n\n\n\n

    \u90a3\u4e48\u600e\u4e48\u77e5\u9053\u5f53\u524d\u7f51\u7edc\u662f\u5426\u51fa\u73b0\u4e86\u62e5\u585e\u5462\uff1f<\/p><\/blockquote>\n\n\n\n

    \u5176\u5b9e\u53ea\u8981\u300c\u53d1\u9001\u65b9\u300d\u6ca1\u6709\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u63a5\u6536\u5230 ACK \u5e94\u7b54\u62a5\u6587\uff0c\u4e5f\u5c31\u662f\u53d1\u751f\u4e86\u8d85\u65f6\u91cd\u4f20\uff0c\u5c31\u4f1a\u8ba4\u4e3a\u7f51\u7edc\u51fa\u73b0\u4e86\u7528\u62e5\u585e\u3002<\/strong><\/p>\n\n\n\n

    <\/p>\n\n\n\n

    \u62e5\u585e\u63a7\u5236\u6709\u54ea\u4e9b\u63a7\u5236\u7b97\u6cd5\uff1f<\/p><\/blockquote>\n\n\n\n

    \u62e5\u585e\u63a7\u5236\u4e3b\u8981\u662f\u56db\u4e2a\u7b97\u6cd5\uff1a<\/p>\n\n\n\n

    • \u6162\u542f\u52a8<\/li>
    • \u62e5\u585e\u907f\u514d<\/li>
    • \u62e5\u585e\u53d1\u751f<\/li>
    • \u5feb\u901f\u6062\u590d<\/li><\/ul>\n\n\n\n

      \u6162\u542f\u52a8<\/h4>\n\n\n\n

      TCP \u5728\u521a\u5efa\u7acb\u8fde\u63a5\u5b8c\u6210\u540e\uff0c\u9996\u5148\u662f\u6709\u4e2a\u6162\u542f\u52a8\u7684\u8fc7\u7a0b\uff0c\u8fd9\u4e2a\u6162\u542f\u52a8\u7684\u610f\u601d\u5c31\u662f\u4e00\u70b9\u4e00\u70b9\u7684\u63d0\u9ad8\u53d1\u9001\u6570\u636e\u5305\u7684\u6570\u91cf\uff0c\u5982\u679c\u4e00\u4e0a\u6765\u5c31\u53d1\u5927\u91cf\u7684\u6570\u636e\uff0c\u8fd9\u4e0d\u662f\u7ed9\u7f51\u7edc\u6dfb\u5835\u5417\uff1f<\/p>\n\n\n\n

      \u6162\u542f\u52a8\u7684\u7b97\u6cd5\u8bb0\u4f4f\u4e00\u4e2a\u89c4\u5219\u5c31\u884c\uff1a\u5f53\u53d1\u9001\u65b9\u6bcf\u6536\u5230\u4e00\u4e2a ACK\uff0c\u62e5\u585e\u7a97\u53e3 cwnd \u7684\u5927\u5c0f\u5c31\u4f1a\u52a0 1\u3002<\/strong><\/p>\n\n\n\n

      \u8fd9\u91cc\u5047\u5b9a\u62e5\u585e\u7a97\u53e3 cwnd<\/code> \u548c\u53d1\u9001\u7a97\u53e3 swnd<\/code> \u76f8\u7b49\uff0c\u4e0b\u9762\u4e3e\u4e2a\u6817\u5b50\uff1a<\/p>\n\n\n\n

      • \u8fde\u63a5\u5efa\u7acb\u5b8c\u6210\u540e\uff0c\u4e00\u5f00\u59cb\u521d\u59cb\u5316 cwnd = 1<\/code>\uff0c\u8868\u793a\u53ef\u4ee5\u4f20\u4e00\u4e2a MSS<\/code> \u5927\u5c0f\u7684\u6570\u636e\u3002<\/li>
      • \u5f53\u6536\u5230\u4e00\u4e2a ACK \u786e\u8ba4\u5e94\u7b54\u540e\uff0ccwnd \u589e\u52a0 1\uff0c\u4e8e\u662f\u4e00\u6b21\u80fd\u591f\u53d1\u9001 2 \u4e2a<\/li>
      • \u5f53\u6536\u5230 2 \u4e2a\u7684 ACK \u786e\u8ba4\u5e94\u7b54\u540e\uff0c cwnd \u589e\u52a0 2\uff0c\u4e8e\u662f\u5c31\u53ef\u4ee5\u6bd4\u4e4b\u524d\u591a\u53d12 \u4e2a\uff0c\u6240\u4ee5\u8fd9\u4e00\u6b21\u80fd\u591f\u53d1\u9001 4 \u4e2a<\/li>
      • \u5f53\u8fd9 4 \u4e2a\u7684 ACK \u786e\u8ba4\u5230\u6765\u7684\u65f6\u5019\uff0c\u6bcf\u4e2a\u786e\u8ba4 cwnd \u589e\u52a0 1\uff0c 4 \u4e2a\u786e\u8ba4 cwnd \u589e\u52a0 4\uff0c\u4e8e\u662f\u5c31\u53ef\u4ee5\u6bd4\u4e4b\u524d\u591a\u53d1 4 \u4e2a\uff0c\u6240\u4ee5\u8fd9\u4e00\u6b21\u80fd\u591f\u53d1\u9001 8 \u4e2a\u3002<\/li><\/ul>\n\n\n\n
        \"\"
        \u6162\u542f\u52a8\u7b97\u6cd5<\/figcaption><\/figure>\n\n\n\n

        \u53ef\u4ee5\u770b\u51fa\u6162\u542f\u52a8\u7b97\u6cd5\uff0c\u53d1\u5305\u7684\u4e2a\u6570\u662f\u6307\u6570\u6027\u7684\u589e\u957f<\/strong>\u3002<\/p>\n\n\n\n

        \u90a3\u6162\u542f\u52a8\u6da8\u5230\u4ec0\u4e48\u65f6\u5019\u662f\u4e2a\u5934\u5462\uff1f<\/p><\/blockquote>\n\n\n\n

        \u6709\u4e00\u4e2a\u53eb\u6162\u542f\u52a8\u95e8\u9650 ssthresh<\/code> \uff08slow start threshold\uff09\u72b6\u6001\u53d8\u91cf\u3002<\/p>\n\n\n\n

        • \u5f53 cwnd<\/code> < ssthresh<\/code> \u65f6\uff0c\u4f7f\u7528\u6162\u542f\u52a8\u7b97\u6cd5\u3002<\/li>
        • \u5f53 cwnd<\/code> >= ssthresh<\/code> \u65f6\uff0c\u5c31\u4f1a\u4f7f\u7528\u300c\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u300d\u3002<\/li><\/ul>\n\n\n\n

          \u62e5\u585e\u907f\u514d\u7b97\u6cd5<\/h4>\n\n\n\n

          \u524d\u9762\u8bf4\u9053\uff0c\u5f53\u62e5\u585e\u7a97\u53e3 cwnd<\/code> \u300c\u8d85\u8fc7\u300d\u6162\u542f\u52a8\u95e8\u9650 ssthresh<\/code> \u5c31\u4f1a\u8fdb\u5165\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u3002<\/p>\n\n\n\n

          \u4e00\u822c\u6765\u8bf4 ssthresh<\/code> \u7684\u5927\u5c0f\u662f 65535<\/code> \u5b57\u8282\u3002<\/p>\n\n\n\n

          \u90a3\u4e48\u8fdb\u5165\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u540e\uff0c\u5b83\u7684\u89c4\u5219\u662f\uff1a\u6bcf\u5f53\u6536\u5230\u4e00\u4e2a ACK \u65f6\uff0ccwnd \u589e\u52a0 1\/cwnd\u3002<\/strong><\/p>\n\n\n\n

          \u63a5\u4e0a\u524d\u9762\u7684\u6162\u542f\u52a8\u7684\u6817\u5b50\uff0c\u73b0\u5047\u5b9a ssthresh<\/code> \u4e3a 8<\/code>\uff1a<\/p>\n\n\n\n

          • \u5f53 8 \u4e2a ACK \u5e94\u7b54\u786e\u8ba4\u5230\u6765\u65f6\uff0c\u6bcf\u4e2a\u786e\u8ba4\u589e\u52a0 1\/8\uff0c8 \u4e2a ACK \u786e\u8ba4 cwnd \u4e00\u5171\u589e\u52a0 1\uff0c\u4e8e\u662f\u8fd9\u4e00\u6b21\u80fd\u591f\u53d1\u9001 9 \u4e2a MSS<\/code> \u5927\u5c0f\u7684\u6570\u636e\uff0c\u53d8\u6210\u4e86\u7ebf\u6027\u589e\u957f\u3002<\/strong><\/li><\/ul>\n\n\n\n
            \"\"
            \u62e5\u585e\u907f\u514d<\/figcaption><\/figure>\n\n\n\n

            \u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\uff0c\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u5c31\u662f\u5c06\u539f\u672c\u6162\u542f\u52a8\u7b97\u6cd5\u7684\u6307\u6570\u589e\u957f\u53d8\u6210\u4e86\u7ebf\u6027\u589e\u957f\uff0c\u8fd8\u662f\u589e\u957f\u9636\u6bb5\uff0c\u4f46\u662f\u589e\u957f\u901f\u5ea6\u7f13\u6162\u4e86\u4e00\u4e9b\u3002<\/p>\n\n\n\n

            \u5c31\u8fd9\u4e48\u4e00\u76f4\u589e\u957f\u7740\u540e\uff0c\u7f51\u7edc\u5c31\u4f1a\u6162\u6162\u8fdb\u5165\u4e86\u62e5\u585e\u7684\u72b6\u51b5\u4e86\uff0c\u4e8e\u662f\u5c31\u4f1a\u51fa\u73b0\u4e22\u5305\u73b0\u8c61\uff0c\u8fd9\u65f6\u5c31\u9700\u8981\u5bf9\u4e22\u5931\u7684\u6570\u636e\u5305\u8fdb\u884c\u91cd\u4f20\u3002<\/p>\n\n\n\n

            \u5f53\u89e6\u53d1\u4e86\u91cd\u4f20\u673a\u5236\uff0c\u4e5f\u5c31\u8fdb\u5165\u4e86\u300c\u62e5\u585e\u53d1\u751f\u7b97\u6cd5\u300d\u3002<\/p>\n\n\n\n

            \u62e5\u585e\u53d1\u751f<\/h4>\n\n\n\n

            \u5f53\u7f51\u7edc\u51fa\u73b0\u62e5\u585e\uff0c\u4e5f\u5c31\u662f\u4f1a\u53d1\u751f\u6570\u636e\u5305\u91cd\u4f20\uff0c\u91cd\u4f20\u673a\u5236\u4e3b\u8981\u6709\u4e24\u79cd\uff1a<\/p>\n\n\n\n

            • \u8d85\u65f6\u91cd\u4f20<\/li>
            • \u5feb\u901f\u91cd\u4f20<\/li><\/ul>\n\n\n\n

              \u8fd9\u4e24\u79cd\u4f7f\u7528\u7684\u62e5\u585e\u53d1\u9001\u7b97\u6cd5\u662f\u4e0d\u540c\u7684\uff0c\u63a5\u4e0b\u6765\u5206\u522b\u6765\u8bf4\u8bf4\u3002<\/p>\n\n\n\n

              <\/p>\n\n\n\n

              \u53d1\u751f\u8d85\u65f6\u91cd\u4f20\u7684\u62e5\u585e\u53d1\u751f\u7b97\u6cd5<\/p><\/blockquote>\n\n\n\n

              \u5f53\u53d1\u751f\u4e86\u300c\u8d85\u65f6\u91cd\u4f20\u300d\uff0c\u5219\u5c31\u4f1a\u4f7f\u7528\u62e5\u585e\u53d1\u751f\u7b97\u6cd5\u3002<\/p>\n\n\n\n

              \u8fd9\u4e2a\u65f6\u5019\uff0cssthresh \u548c cwnd \u7684\u503c\u4f1a\u53d1\u751f\u53d8\u5316\uff1a<\/p>\n\n\n\n

              • ssthresh<\/code> \u8bbe\u4e3a cwnd\/2<\/code>\uff0c<\/li>
              • cwnd<\/code> \u91cd\u7f6e\u4e3a 1<\/code><\/li><\/ul>\n\n\n\n
                \n
                \n
                \"\"
                \u62e5\u585e\u53d1\u9001 \u2014\u2014 \u8d85\u65f6\u91cd\u4f20<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

                \u63a5\u7740\uff0c\u5c31\u91cd\u65b0\u5f00\u59cb\u6162\u542f\u52a8\uff0c\u6162\u542f\u52a8\u662f\u4f1a\u7a81\u7136\u51cf\u5c11\u6570\u636e\u6d41\u7684\u3002\u8fd9\u771f\u662f\u4e00\u65e6\u300c\u8d85\u65f6\u91cd\u4f20\u300d\uff0c\u9a6c\u4e0a\u56de\u5230\u89e3\u653e\u524d\u3002\u4f46\u662f\u8fd9\u79cd\u65b9\u5f0f\u592a\u6fc0\u8fdb\u4e86\uff0c\u53cd\u5e94\u4e5f\u5f88\u5f3a\u70c8\uff0c\u4f1a\u9020\u6210\u7f51\u7edc\u5361\u987f\u3002<\/p>\n\n\n\n

                \u5c31\u597d\u50cf\u672c\u6765\u5728\u79cb\u540d\u5c71\u9ad8\u901f\u6f02\u79fb\u7740\uff0c\u7a81\u7136\u6765\u4e2a\u7d27\u6025\u5239\u8f66\uff0c\u8f6e\u80ce\u53d7\u5f97\u4e86\u5417\u3002\u3002\u3002<\/p>\n\n\n\n

                <\/p>\n\n\n\n

                \u53d1\u751f\u5feb\u901f\u91cd\u4f20\u7684\u62e5\u585e\u53d1\u751f\u7b97\u6cd5<\/p><\/blockquote>\n\n\n\n

                \u8fd8\u6709\u66f4\u597d\u7684\u65b9\u5f0f\uff0c\u524d\u9762\u6211\u4eec\u8bb2\u8fc7\u300c\u5feb\u901f\u91cd\u4f20\u7b97\u6cd5\u300d\u3002\u5f53\u63a5\u6536\u65b9\u53d1\u73b0\u4e22\u4e86\u4e00\u4e2a\u4e2d\u95f4\u5305\u7684\u65f6\u5019\uff0c\u53d1\u9001\u4e09\u6b21\u524d\u4e00\u4e2a\u5305\u7684 ACK\uff0c\u4e8e\u662f\u53d1\u9001\u7aef\u5c31\u4f1a\u5feb\u901f\u5730\u91cd\u4f20\uff0c\u4e0d\u5fc5\u7b49\u5f85\u8d85\u65f6\u518d\u91cd\u4f20\u3002<\/p>\n\n\n\n

                TCP \u8ba4\u4e3a\u8fd9\u79cd\u60c5\u51b5\u4e0d\u4e25\u91cd\uff0c\u56e0\u4e3a\u5927\u90e8\u5206\u6ca1\u4e22\uff0c\u53ea\u4e22\u4e86\u4e00\u5c0f\u90e8\u5206\uff0c\u5219 ssthresh<\/code> \u548c cwnd<\/code> \u53d8\u5316\u5982\u4e0b\uff1a<\/p>\n\n\n\n

                • cwnd = cwnd\/2<\/code> \uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u4e3a\u539f\u6765\u7684\u4e00\u534a;<\/li>
                • ssthresh = cwnd<\/code>;<\/li>
                • \u8fdb\u5165\u5feb\u901f\u6062\u590d\u7b97\u6cd5<\/li><\/ul>\n\n\n\n

                  \u5feb\u901f\u6062\u590d<\/h4>\n\n\n\n

                  \u5feb\u901f\u91cd\u4f20\u548c\u5feb\u901f\u6062\u590d\u7b97\u6cd5\u4e00\u822c\u540c\u65f6\u4f7f\u7528\uff0c\u5feb\u901f\u6062\u590d\u7b97\u6cd5\u662f\u8ba4\u4e3a\uff0c\u4f60\u8fd8\u80fd\u6536\u5230 3 \u4e2a\u91cd\u590d ACK \u8bf4\u660e\u7f51\u7edc\u4e5f\u4e0d\u90a3\u4e48\u7cdf\u7cd5\uff0c\u6240\u4ee5\u6ca1\u6709\u5fc5\u8981\u50cf RTO<\/code> \u8d85\u65f6\u90a3\u4e48\u5f3a\u70c8\u3002<\/p>\n\n\n\n

                  \u6b63\u5982\u524d\u9762\u6240\u8bf4\uff0c\u8fdb\u5165\u5feb\u901f\u6062\u590d\u4e4b\u524d\uff0ccwnd<\/code> \u548c ssthresh<\/code> \u5df2\u88ab\u66f4\u65b0\u4e86\uff1a<\/p>\n\n\n\n

                  • cwnd = cwnd\/2<\/code> \uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u4e3a\u539f\u6765\u7684\u4e00\u534a;<\/li>
                  • ssthresh = cwnd<\/code>;<\/li><\/ul>\n\n\n\n

                    \u7136\u540e\uff0c\u8fdb\u5165\u5feb\u901f\u6062\u590d\u7b97\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n

                    • \u62e5\u585e\u7a97\u53e3 cwnd = ssthresh + 3<\/code> \uff08 3 \u7684\u610f\u601d\u662f\u786e\u8ba4\u6709 3 \u4e2a\u6570\u636e\u5305\u88ab\u6536\u5230\u4e86\uff09\uff1b<\/li>
                    • \u91cd\u4f20\u4e22\u5931\u7684\u6570\u636e\u5305\uff1b<\/li>
                    • \u5982\u679c\u518d\u6536\u5230\u91cd\u590d\u7684 ACK\uff0c\u90a3\u4e48 cwnd \u589e\u52a0 1\uff1b<\/li>
                    • \u5982\u679c\u6536\u5230\u65b0\u6570\u636e\u7684 ACK \u540e\uff0c\u628a cwnd \u8bbe\u7f6e\u4e3a\u7b2c\u4e00\u6b65\u4e2d\u7684 ssthresh \u7684\u503c\uff0c\u539f\u56e0\u662f\u8be5 ACK \u786e\u8ba4\u4e86\u65b0\u7684\u6570\u636e\uff0c\u8bf4\u660e\u4ece duplicated ACK \u65f6\u7684\u6570\u636e\u90fd\u5df2\u6536\u5230\uff0c\u8be5\u6062\u590d\u8fc7\u7a0b\u5df2\u7ecf\u7ed3\u675f\uff0c\u53ef\u4ee5\u56de\u5230\u6062\u590d\u4e4b\u524d\u7684\u72b6\u6001\u4e86\uff0c\u4e5f\u5373\u518d\u6b21\u8fdb\u5165\u62e5\u585e\u907f\u514d\u72b6\u6001\uff1b<\/li><\/ul>\n\n\n\n
                      \"\"
                      \u5feb\u901f\u91cd\u4f20\u548c\u5feb\u901f\u6062\u590d<\/figcaption><\/figure>\n\n\n\n

                      \u4e5f\u5c31\u662f\u6ca1\u6709\u50cf\u300c\u8d85\u65f6\u91cd\u4f20\u300d\u4e00\u591c\u56de\u5230\u89e3\u653e\u524d\uff0c\u800c\u662f\u8fd8\u5728\u6bd4\u8f83\u9ad8\u7684\u503c\uff0c\u540e\u7eed\u5448\u7ebf\u6027\u589e\u957f\u3002<\/p>\n\n\n\n

                      \u62e5\u585e\u7b97\u6cd5\u793a\u610f\u56fe<\/h4>\n\n\n\n

                      \u597d\u4e86\uff0c\u4ee5\u4e0a\u5c31\u662f\u62e5\u585e\u63a7\u5236\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u770b\u5b8c\u540e\uff0c\u4f60\u518d\u6765\u770b\u4e0b\u9762\u8fd9\u5f20\u56fe\u7247\uff0c\u6bcf\u4e2a\u8fc7\u7a0b\u6211\u76f8\u4fe1\u4f60\u90fd\u80fd\u660e\u767d\uff1a<\/p>\n\n\n\n

                      \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

                      \u8f6c\u8f7d\u4e8e\uff1ahttps:\/\/www.cnblogs.com\/xiaolincoding\/p\/12732052.ht […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/277"}],"collection":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=277"}],"version-history":[{"count":1,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions"}],"predecessor-version":[{"id":283,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions\/283"}],"wp:attachment":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=277"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=277"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}