{"id":292,"date":"2026-09-06T01:22:36","date_gmt":"2026-09-05T17:22:36","guid":{"rendered":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/06\/tcp-congestion-control-evolution\/"},"modified":"2026-09-06T01:22:36","modified_gmt":"2026-09-05T17:22:36","slug":"tcp-congestion-control-evolution","status":"publish","type":"post","link":"https:\/\/www.ziliaochi.cn\/index.php\/2026\/09\/06\/tcp-congestion-control-evolution\/","title":{"rendered":"TCP \u62e5\u585e\u63a7\u5236\u6f14\u8fdb\uff1a\u4ece Reno\u3001CUBIC \u5230 BBR v3"},"content":{"rendered":"
\n
\u5173\u952e\u8bcd<\/span>TCP \u62e5\u585e\u63a7\u5236\u3001CUBIC\u3001BBR\u3001\u6162\u542f\u52a8\u3001AIMD\u3001bufferbloat<\/div>\n
\n
\u76ee\u5f55<\/div>\n
    \n
  1. \u4e00\u3001\u95ee\u9898\u672c\u8d28\uff1a\u7f51\u7edc\u662f\u4e2a\u6ca1\u6709\u4e2d\u592e\u8c03\u5ea6\u7684\u5171\u4eab\u7cfb\u7edf<\/a><\/li>\n
  2. \u4e8c\u3001\u4e09\u4ee3\u7b97\u6cd5\u7684\u6f14\u8fdb\u903b\u8f91<\/a><\/li>\n
  3. \u4e09\u3001\u5de5\u7a0b\u89c6\u89d2\uff1aLinux \u4e0b\u600e\u4e48\u8c03<\/a><\/li>\n
  4. \u56db\u3001\u4e0e\u9762\u8bd5\u9ad8\u9891\u95ee\u9898\u7684\u5bf9\u9f50<\/a><\/li>\n<\/ol>\n<\/div>\n

    TCP \u62e5\u585e\u63a7\u5236\u662f\u9762\u8bd5\u4e0e\u5b9e\u9645\u8c03\u4f18\u7684\u4ea4\u53c9\u5730\u5e26\uff1a\u9762\u8bd5\u5b98\u7528\u5b83\u8003\u5bdf\u7f51\u7edc\u7406\u89e3\u7684\u6df1\u5ea6\uff0c\u5de5\u7a0b\u5e08\u5219\u4f1a\u5728\u4f20\u8f93\u5bc6\u96c6\u578b\u670d\u52a1\uff08\u4e0a\u4f20\u4e0b\u8f7d\u3001\u76f4\u64ad\u63a8\u6d41\u3001\u8de8\u673a\u623f\u540c\u6b65\uff09\u91cc\u771f\u5b9e\u9047\u5230\u5b83\u30022026 \u5e74\u7684\u751f\u4ea7\u73af\u5883\uff0cCUBIC \u4ecd\u662f Linux \u9ed8\u8ba4\uff0c\u4f46 BBR\uff08\u5df2\u8fed\u4ee3\u5230 v3\uff0c\u7eb3\u5165 \u76f8\u5173 RFC \u4f53\u7cfb<\/a>\u7684\u8ba8\u8bba\uff09\u5728\u9ad8\u4e22\u5305\u3001\u957f\u80a5\u7ba1\u9053\u573a\u666f\u7684\u4f18\u52bf\u5df2\u7ecf\u88ab\u5e7f\u6cdb\u9a8c\u8bc1\u3002\u8fd9\u7bc7\u628a\u6f14\u8fdb\u8109\u7edc\u4e0e\u5de5\u7a0b\u9009\u578b\u4e00\u6b21\u8bb2\u6e05\u3002<\/p>\n

    \u4e00\u3001\u95ee\u9898\u672c\u8d28\uff1a\u7f51\u7edc\u662f\u4e2a\u6ca1\u6709\u4e2d\u592e\u8c03\u5ea6\u7684\u5171\u4eab\u7cfb\u7edf<\/h2>\n

    \u8def\u7531\u5668\u7f13\u5b58\u6709\u9650\uff0c\u6240\u6709\u53d1\u9001\u65b9\u52a0\u8d77\u6765\u7684\u901f\u7387\u8d85\u8fc7\u94fe\u8def\u5bb9\u91cf\u5c31\u4f1a\u62e5\u585e\u2014\u2014\u961f\u5217\u5806\u79ef\u3001\u5ef6\u8fdf\u66b4\u6da8\u3001\u6700\u7ec8\u4e22\u5305\u3002\u62e5\u585e\u63a7\u5236\u7684\u672c\u8d28\u662f\u5206\u5e03\u5f0f\u9650\u6d41\u534f\u8bae<\/strong>\uff1a\u6bcf\u4e2a\u53d1\u9001\u65b9\u6839\u636e\u9690\u5f0f\u4fe1\u53f7\uff08\u4e22\u5305\/\u5ef6\u8fdf\uff09\u731c\u6d4b\u7f51\u7edc\u72b6\u6001\uff0c\u81ea\u89c9\u8c03\u6574\u53d1\u9001\u901f\u7387\u3002\u6574\u4e2a\u7b97\u6cd5\u56f4\u7ed5\u4e00\u4e2a\u7a97\u53e3 cwnd<\/code> \u5c55\u5f00\uff0c\u5b9e\u9645\u53d1\u9001\u91cf \u2248 min(\u62e5\u585e\u7a97\u53e3, \u63a5\u6536\u7a97\u53e3)\u3002<\/p>\n

    \u4e8c\u3001\u4e09\u4ee3\u7b97\u6cd5\u7684\u6f14\u8fdb\u903b\u8f91<\/h2>\n\n\n\n\n\n
    \u7b97\u6cd5<\/th>\n\u62e5\u585e\u4fe1\u53f7<\/th>\n\u6838\u5fc3\u7b56\u7565<\/th>\n\u77ed\u677f<\/th>\n<\/tr>\n
    Reno\uff081988\uff09<\/td>\n\u4e22\u5305<\/td>\n\u6162\u542f\u52a8\u6307\u6570\u589e\u957f \u2192 \u4e22\u5305\u540e\u51cf\u534a\uff08AIMD\uff09\uff0c\u7ebf\u6027\u722c\u5761<\/td>\n\u9ad8\u5e26\u5bbd\u957f\u5ef6\u8fdf\u7f51\u7edc\u722c\u5347\u6781\u6162\uff0c\u6df1\u961f\u5217\u7f13\u51b2\u5bfc\u81f4 bufferbloat<\/td>\n<\/tr>\n
    CUBIC\uff08Linux \u9ed8\u8ba4\uff09<\/td>\n\u4e22\u5305<\/td>\n\u7a97\u53e3\u589e\u957f\u66f2\u7ebf\u6309\u4e09\u6b21\u51fd\u6570\uff1a\u63a5\u8fd1\u4e0a\u6b21\u74f6\u9888\u65f6\u51cf\u901f\uff0c\u8fdc\u79bb\u65f6\u52a0\u901f<\/td>\n\u4ecd\u4f9d\u8d56\u300c\u586b\u6ee1\u961f\u5217\u624d\u4e22\u5305\u300d\u7684\u4fe1\u53f7\uff0c\u5ef6\u8fdf\u6362\u541e\u5410<\/td>\n<\/tr>\n
    BBR\uff08v1\u2192v3\uff09<\/td>\n\u5e26\u5bbd\u4e0e RTT \u6d4b\u91cf<\/td>\n\u4e3b\u52a8\u4f30\u8ba1\u74f6\u9888\u5e26\u5bbd btlbw \u4e0e\u6700\u5c0f RTT rtprop\uff0c\u5de5\u4f5c\u5728 BDP \u9644\u8fd1\u800c\u4e0d\u586b\u6ee1\u961f\u5217<\/td>\n\u4e0e\u57fa\u4e8e\u4e22\u5305\u7684\u6d41\u91cf\u5171\u5b58\u65f6\u516c\u5e73\u6027\u95ee\u9898\uff08v2\/v3 \u91cd\u70b9\u4fee\u590d\uff09<\/td>\n<\/tr>\n<\/table>\n

    \u7406\u89e3 CUBIC \u4e0e BBR \u7684\u5206\u6c34\u5cad\uff1a\u4e22\u5305 \u2260 \u62e5\u585e<\/strong>\u3002Wi-Fi\u30015G\u3001\u8de8\u6d0b\u94fe\u8def\u5b58\u5728\u5927\u91cf\u975e\u62e5\u585e\u6027\u4e22\u5305\uff0c\u628a\u4e22\u5305\u5f53\u62e5\u585e\u4fe1\u53f7\u4f1a\u5bfc\u81f4\u8fd9\u4e9b\u573a\u666f\u4e0b\u7684\u5e26\u5bbd\u5229\u7528\u7387\u6781\u4f4e\u2014\u2014\u8fd9\u6b63\u662f BBR \u7684\u51fa\u53d1\u70b9\u3002<\/p>\n

    \"\u4e09\u4ee3\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u5bf9\u7167\"
    <\/figcaption><\/figure>\n

    \u4e09\u3001\u5de5\u7a0b\u89c6\u89d2\uff1aLinux \u4e0b\u600e\u4e48\u8c03<\/h2>\n
    # \u67e5\u770b\u53ef\u7528\u4e0e\u5f53\u524d\u7b97\u6cd5\nsysctl net.ipv4.tcp_available_congestion_control\nsysctl net.ipv4.tcp_congestion_control\n\n# \u542f\u7528 BBR\uff08\u5185\u6838 4.9+\uff0cv3 \u9700\u8981\u8f83\u65b0\u5185\u6838\uff09\nmodprobe tcp_bbr\nsysctl -w net.ipv4.tcp_congestion_control=bbr\nsysctl -w net.core.default_qdisc=fq   # BBR \u63a8\u8350 fq \u961f\u5217\u89c4\u5219<\/code><\/pre>\n
    \u9009\u578b\u7ecf\u9a8c\uff1a\u5185\u7f51\u6216\u4e22\u5305\u6781\u4f4e\u7684\u73af\u5883\uff0cCUBIC \u4e0e BBR \u5dee\u8ddd\u4e0d\u5927\uff0c\u9ed8\u8ba4\u5373\u53ef\uff1b\u8de8\u5730\u57df\u4f20\u8f93\u3001\u79fb\u52a8\u7f51\u7edc\u3001\u536b\u661f\/\u8de8\u5883\u94fe\u8def\uff0cBBR \u6536\u76ca\u663e\u8457<\/strong>\uff08\u541e\u5410\u63d0\u5347\u6570\u500d\u662f\u5e38\u89c1\u7ed3\u679c\uff09\u3002\u53cd\u5411\u4ee3\u7406\u4e0e\u4e0b\u8f7d\u670d\u52a1\u503c\u5f97\u9010\u53f0\u8bc4\u4f30\u5207\u6362\uff0c\u6ce8\u610f\u670d\u52a1\u7aef\u4e0e\u5bf9\u7aef\u5404\u81ea\u7684\u7b97\u6cd5\u72ec\u7acb\u751f\u6548\u3002<\/p>\n
    \u56db\u3001\u4e0e\u9762\u8bd5\u9ad8\u9891\u95ee\u9898\u7684\u5bf9\u9f50<\/h2>\n
      \n
    • \u6162\u542f\u52a8\u4e3a\u4ec0\u4e48\u5b58\u5728<\/strong>\uff1a\u6ca1\u6709\u5148\u9a8c\u4fe1\u606f\u65f6\u7528\u6307\u6570\u589e\u957f\u5feb\u901f\u63a2\u6d4b\u53ef\u7528\u5e26\u5bbd\uff0c\u76f4\u5230\u4e22\u5305\u6216\u8fbe\u5230\u9608\u503c\uff08ssthresh\uff09\u8f6c\u5165\u62e5\u585e\u907f\u514d\uff1b<\/li>\n
    • AIMD \u4e3a\u4ec0\u4e48\u516c\u5e73<\/strong>\uff1a\u52a0\u6027\u589e\uff08\u6bcf RTT +1\uff09\u4f7f\u5404\u6d41\u7ebf\u6027\u722c\u5347\uff0c\u4e58\u6027\u51cf\uff08\u51cf\u534a\uff09\u8ba9\u5360\u7528\u591a\u7684\u6d41\u8ba9\u51fa\u66f4\u591a\uff0c\u957f\u671f\u6536\u655b\u5230\u516c\u5e73\u5206\u4eab\uff1b<\/li>\n
    • BBR \u4e3a\u4ec0\u4e48\u4e0d\u6015\u968f\u673a\u4e22\u5305<\/strong>\uff1a\u5b83\u4e0d\u628a\u4e22\u5305\u5f53\u62e5\u585e\u4fe1\u53f7\uff0c\u53ea\u4f9d\u636e btlbw \u4e0e rtprop \u4e24\u4e2a\u6d4b\u91cf\u503c\u63a7\u5236\u901f\u7387\uff1b<\/li>\n
    • bufferbloat \u662f\u4ec0\u4e48<\/strong>\uff1a\u8fc7\u5927\u7684\u8def\u7531\u5668\u7f13\u51b2\u8ba9\u300c\u586b\u6ee1\u7f13\u51b2\u624d\u4e22\u5305\u300d\u7684\u7b97\u6cd5\u628a\u5ef6\u8fdf\u63a8\u5230\u6570\u767e\u6beb\u79d2\u2014\u2014CUBIC \u65f6\u4ee3\u7f51\u9875\u5361\u987f\u7684\u7ecf\u5178\u6839\u6e90\u4e4b\u4e00\u3002<\/li>\n<\/ul>\n
      \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u4ece Reno \u5230 CUBIC \u662f\u300c\u66f4\u806a\u660e\u5730\u5229\u7528\u4e22\u5305\u4fe1\u53f7\u300d\uff0c\u4ece CUBIC \u5230 BBR \u662f\u300c\u6362\u6389\u4fe1\u53f7\u672c\u8eab\u300d\u3002\u7406\u89e3\u8fd9\u6761\u4e3b\u7ebf\uff0c\u7b97\u6cd5\u7ec6\u8282\u90fd\u53ef\u4ee5\u73b0\u573a\u63a8\u5bfc\u3002<\/p>\n
      \n
      \u6807\u7b7e<\/div>\n
      #TCP<\/span>#\u7f51\u7edc\u534f\u8bae<\/span>#BBR<\/span>#\u6027\u80fd\u8c03\u4f18<\/span><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
      \u62e5\u585e\u63a7\u5236\u7684\u5206\u5e03\u5f0f\u9650\u6d41\u672c\u8d28\u3001Reno\/CUBIC\/BBR \u4e09\u4ee3\u7b97\u6cd5\u7684\u6f14\u8fdb\u903b\u8f91\u5bf9\u7167\u3001Linux \u4e0b BBR \u7684\u542f\u7528\u914d\u7f6e\u4e0e\u9009\u578b\u7ecf\u9a8c\uff0c\u4ee5\u53ca\u6162\u542f\u52a8\u3001AIMD\u3001bufferbloat \u7b49\u9ad8\u9891\u9762\u8bd5\u95ee\u9898\u7684\u63a8\u5bfc\u5f0f\u56de\u7b54\u3002<\/p>\n","protected":false},"author":1,"featured_media":290,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,9],"tags":[163,161,142,162],"class_list":["post-292","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical","category-computer-basics","tag-bbr","tag-tcp","tag-142","tag-162"],"_links":{"self":[{"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/posts\/292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/comments?post=292"}],"version-history":[{"count":0,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/posts\/292\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/media\/290"}],"wp:attachment":[{"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/media?parent=292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/categories?post=292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ziliaochi.cn\/index.php\/wp-json\/wp\/v2\/tags?post=292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}