{"id":679,"date":"2025-06-12T18:57:00","date_gmt":"2025-06-12T10:57:00","guid":{"rendered":"https:\/\/reverieland.cn\/?p=679"},"modified":"2025-09-21T19:06:29","modified_gmt":"2025-09-21T11:06:29","slug":"%e5%a4%8d%e4%b9%a0-tcp%e6%8b%a5%e5%a1%9e%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/reverieland.cn\/index.php\/679\/","title":{"rendered":"\u590d\u4e60-TCP\u62e5\u585e\u63a7\u5236"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n
\n\n\n\n

1. \u6162\u542f\u52a8\uff08Slow Start\uff09<\/strong><\/h3>\n\n\n\n
    \n
  • \u521d\u59cb cwnd=1<\/code>\uff08\u62e5\u585e\u7a97\u53e3\u5927\u5c0f\uff09\u3002<\/li>\n\n\n\n
  • \u6bcf\u6536\u5230\u4e00\u4e2a ACK\uff0ccwnd<\/code> \u7ffb\u500d\u589e\u957f\uff08\u6307\u6570\u7ea7\u589e\u957f\uff09\u3002<\/li>\n\n\n\n
  • \u56fe\u4e2d\u524d 0~3 \u8f6e\u6b21\uff0ccwnd<\/code> \u4f9d\u6b21\u4ece 1 \u2192 2 \u2192 4 \u2192 8\u3002<\/li>\n\n\n\n
  • \u5f53 cwnd<\/code> \u8fbe\u5230 \u6162\u542f\u52a8\u95e8\u9650 ssthresh=8<\/code><\/strong> \u65f6\uff0c\u8fdb\u5165\u4e0b\u4e00\u4e2a\u9636\u6bb5\u3002<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n

    2. \u62e5\u585e\u907f\u514d\uff08Congestion Avoidance\uff09<\/strong><\/h3>\n\n\n\n
      \n
    • \u589e\u957f\u901f\u5ea6\u653e\u7f13\uff1a\u6bcf\u6536\u5230\u4e00\u8f6e ACK\uff0ccwnd<\/code> \u53ea\u52a0 1\uff08\u7ebf\u6027\u589e\u957f\uff09\u3002<\/li>\n\n\n\n
    • \u56fe\u4e2d 4~7 \u8f6e\u6b21\uff0ccwnd<\/code> \u4ece 8 \u2192 9 \u2192 10 \u2192 11 \u2192 12\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      3. \u5feb\u91cd\u4f20\uff08Fast Retransmit\uff09<\/strong><\/h3>\n\n\n\n
        \n
      • \u5f53\u6536\u5230 3 \u4e2a\u91cd\u590d\u7684 ACK<\/strong> \u65f6\uff0c\u8ba4\u4e3a\u53d1\u751f\u4e86\u4e22\u5305\u3002<\/li>\n\n\n\n
      • \u89e6\u53d1\u5feb\u901f\u91cd\u4f20\u673a\u5236\uff1a\n
          \n
        1. \u5c06 ssthresh = cwnd\/2<\/code>\uff08\u539f\u6765\u662f 12\uff0c\u53d8\u4e3a 6\uff09\u3002<\/li>\n\n\n\n
        2. \u5c06 cwnd<\/code> \u6536\u7f29\u4e3a ssthresh + 3 = 9<\/code>\uff08\u8868\u793a\u7acb\u523b\u8fdb\u5165\u5feb\u6062\u590d\uff0c\u800c\u4e0d\u662f\u9000\u56de\u5230 1\uff09\u3002<\/li>\n<\/ol>\n<\/li>\n\n\n\n
        3. \u56fe\u4e2d\u7b2c 7 \u8f6e\uff0ccwnd=12<\/code> \u53d1\u751f\u4e22\u5305\uff0c\u6536\u5230 3 \u4e2a\u91cd\u590d ACK\uff0c\u8fdb\u5165\u5feb\u91cd\u4f20\u3002<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          4. \u5feb\u6062\u590d\uff08Fast Recovery\uff09<\/strong><\/h3>\n\n\n\n
            \n
          • \u8fdb\u5165\u5feb\u6062\u590d\u72b6\u6001\u65f6\uff0ccwnd = ssthresh + 3<\/code>\u3002<\/li>\n\n\n\n
          • \u5728\u6536\u5230\u91cd\u590d ACK \u65f6\uff0ccwnd<\/code> \u589e\u52a0 1\u3002<\/li>\n\n\n\n
          • \u56fe\u4e2d\u7b2c 8~10 \u8f6e\u6b21\uff0ccwnd<\/code> \u4ece 9 \u2192 10 \u2192 11\u3002<\/li>\n\n\n\n
          • \u5f53\u6536\u5230\u65b0\u7684\u6570\u636e ACK \u65f6\uff0c\u8bf4\u660e\u4e22\u5305\u6570\u636e\u5df2\u7ecf\u6062\u590d\u4f20\u8f93\uff0c\u6b64\u65f6\uff1a\n
              \n
            • cwnd = ssthresh = 6<\/code><\/li>\n\n\n\n
            • \u9000\u51fa\u5feb\u6062\u590d\uff0c\u8fdb\u5165 \u62e5\u585e\u907f\u514d\u9636\u6bb5<\/strong>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n

              5. \u62e5\u585e\u907f\u514d\uff08\u518d\u6b21\u8fdb\u5165\uff09<\/strong><\/h3>\n\n\n\n
                \n
              • \u56fe\u4e2d\u7b2c 12~15 \u8f6e\uff0ccwnd<\/code> \u4ece 6 \u2192 7 \u2192 8 \u2192 9\uff0c\u7ebf\u6027\u589e\u957f\u3002<\/li>\n<\/ul>\n\n\n\n
                \n\n\n\n

                \u2705 \u603b\u7ed3\u4e00\u4e0b\u51e0\u4e2a\u9636\u6bb5\u7684\u7279\u70b9\uff1a<\/p>\n\n\n\n

                  \n
                • \u6162\u542f\u52a8<\/strong>\uff1a\u6307\u6570\u589e\u957f\uff08\u5feb\uff0c\u4f46\u98ce\u9669\u9ad8\uff09\u3002<\/li>\n\n\n\n
                • \u62e5\u585e\u907f\u514d<\/strong>\uff1a\u7ebf\u6027\u589e\u957f\uff08\u6162\uff0c\u4f46\u7a33\uff09\u3002<\/li>\n\n\n\n
                • \u5feb\u91cd\u4f20<\/strong>\uff1a\u68c0\u6d4b\u5230\u4e22\u5305\u65f6\uff0c\u4e0d\u7b49\u8d85\u65f6\uff0c\u7acb\u523b\u91cd\u4f20\u3002<\/li>\n\n\n\n
                • \u5feb\u6062\u590d<\/strong>\uff1a\u4e0d\u56de\u9000\u5230 1\uff0c\u800c\u662f cwnd=ssthresh<\/code>\uff0c\u5feb\u901f\u6062\u590d\u5230\u7a33\u5b9a\u589e\u957f\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

                  1. \u6162\u542f\u52a8\uff08Slow Start\uff09 2. \u62e5\u585e\u907f\u514d\uff08Congestion Avoidance\uff09 3. \u5feb\u91cd\u4f20\uff08Fast Retr …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-679","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/posts\/679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/comments?post=679"}],"version-history":[{"count":1,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/posts\/679\/revisions"}],"predecessor-version":[{"id":682,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/posts\/679\/revisions\/682"}],"wp:attachment":[{"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/media?parent=679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/categories?post=679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/reverieland.cn\/index.php\/wp-json\/wp\/v2\/tags?post=679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}