{"id":3162,"date":"2011-10-27T20:19:27","date_gmt":"2011-10-27T12:19:27","guid":{"rendered":"http:\/\/www.orczhou.com\/?p=3162"},"modified":"2024-12-28T11:11:27","modified_gmt":"2024-12-28T03:11:27","slug":"tcpip-protocol-start-rto","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2011\/10\/tcpip-protocol-start-rto\/","title":{"rendered":"TCP\/IP\u91cd\u4f20\u8d85\u65f6&#8211;RTO"},"content":{"rendered":"\n<p>\u6982\u8ff0\uff1a\u672c\u6587\u8ba8\u8bba\u4e3b\u673a\u5728\u53d1\u9001\u4e00\u4e2aTCP\u6570\u636e\u5305\u540e\uff0c\u5982\u679c\u8fdf\u8fdf\u6ca1\u6709\u6536\u5230ACK\uff0c\u4e3b\u673a\u591a\u4e45\u540e\u4f1a\u91cd\u4f20\u8fd9\u4e2a\u6570\u636e\u5305\u3002\u4e3b\u673a\u4ece\u53d1\u51fa\u6570\u636e\u5305\u5230\u7b2c\u4e00\u6b21TCP\u91cd\u4f20\u5f00\u59cb\uff0c<a href=\"http:\/\/zh.wikipedia.org\/wiki\/RFC#RFC.E6.96.87.E4.BB.B6.E7.9A.84.E7.94.A2.E7.94.9F\">RFC<\/a>\u4e2d\u8fd9\u6bb5\u65f6\u95f4\u95f4\u9694\u79f0\u4e3aretransmission timeout\uff0c\u7f29\u5199\u505aRTO\u3002\u672c\u6587\u4f1a\u5148\u770b\u770bRFC\u4e2d\u5982\u4f55\u5b9a\u4e49RTO\uff0c\u7136\u540e\u770b\u770bLinux\u4e2d\u5982\u4f55\u5b9e\u73b0\u3002<strong>\u672c\u6587\u65e8\u5728\u5206\u4eab<\/strong>\uff1a\u5f53\u9047\u5230\u4e86TCP\u5c42\u95ee\u9898\u6539\u5982\u4f55\u53bb\u67e5\u627e\u3001\u9605\u8bfb\u6587\u6863\uff0c\u8be5\u5982\u4f55\u53bb\u5728Linux\u6e90\u7801\u4e2d\u5bfb\u6c42\u7b54\u6848\u3002<\/p>\n\n\n\n\n\n\n<h3 class=\"wp-block-heading\">\u8d77\u6e90<\/h3>\n\n\n\n<p>\u5728\u5206\u6790MySQL Semi-sync\u6545\u969c\u65f6\uff0c\u6211\u4eec\u7528Tcpdump+Wireshark\uff08\u611f\u8c22\u6dd8\u5b9d\u96d5\u6881\uff09\u6293\u4f4f\u5f53\u65f6\u7684\u7f51\u7edc\u5305\u4f20\u9001\u7ec6\u8282\uff0c\u89c2\u5bdf\u5230\u4e86\u4e00\u6b21TCP\u91cd\u4f20\u6700\u7ec8\u5bfc\u81f4\u4e86Semi-sync\u8d85\u65f6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\u7b2c\u4e00\u6b21\u4f20\u8f93\n13:55:11.893291 master => slave\tBinlog pos:319890197\n\u91cd\u4f20\uff1a\n13:55:12.094596\tmaster => slave\tBinlog pos:319890197<\/code><\/pre>\n\n\n\n<p>\u770b\u5230\u4e24\u6b21\u4f20\u9001\u95f4\u9694\u7ea6201\u6beb\u79d2\uff0c\u5373\u7b2c\u4e00\u6b21\u4f20\u8f93201\u6beb\u79d2\u540e\uff0c\u8fd8\u6ca1\u6709\u6536\u5230ACK\u54cd\u5e94\uff0cTCP\u8ba4\u4e3a\u4f20\u8f93\u8d85\u65f6\uff0c\u5f00\u59cb\u91cd\u4f20\u3002<\/p>\n\n\n\n<p>\u7591\u95ee\uff1ahost\u548chost\u4e4b\u95f4\u7684RTT\u5927\u7ea6\u662f0.5\u6beb\u79d2\uff0c\u4e3a\u4ec0\u4e48\u7b2c\u4e00\u6b21\u91cd\u4f20\u9700\u8981\u7b49200\u6beb\u79d2\uff1f\uff08\u6211\u5e0c\u671b\u662f&lt;20ms\uff09socket\u7a0b\u5e8f\u53ef\u4ee5\u914d\u7f6e\u5417RTO\u5417\uff1fTCP\u6709\u53c2\u6570\u53ef\u914d\u7f6eRTO\u5417\uff1f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Google\/\u4e66\u7c4d\/RFC<\/h3>\n\n\n\n<p>\u7ffb\u5f00TCP\/IP\u8be6\u89e3\u627e\u5230\u5173\u4e8eTCP Retransmission\u7ae0\u8282\uff0c\u8f83\u8be6\u7ec6\u7684\u4ecb\u7ecdTCP\u7684\u8d85\u65f6\u673a\u5236\uff0c\u4e66\u4e2d\u662f\u4e2a\u6982\u8ff0\uff0c\u4e8e\u662f\u53c8\u627e\u5230RFC1122\u3002<\/p>\n\n\n\n<p>RFC1122\u76844.2.2.15\u548c4.2.3.1\u90fd\u4ecb\u7ecd\u4e86Retransmission Timeout\u7684\u5904\u7406\uff08\u8bf4\u6765\u60ed\u6127\uff0c\u8fd9\u662f\u7b2c\u4e00\u6b21\u9605\u8bfbTCP\u76f8\u5173RFC\uff09\u3002<\/p>\n\n\n\n<p>\u5728<a href=\"http:\/\/www.ietf.org\/rfc.html\">RFC\u4e2d\u641c\u7d22<\/a>Retransmission\u53d1\u73b0RFC 793 1122 2988 6298\u90fd\u6709\u5bf9\u91cd\u4f20\u7b97\u6cd5\u3001\u548c\u521d\u6b21\u91cd\u4f20\u8d85\u65f6\u7684\u63cf\u8ff0\u3002\u4e8e\u662f\u5f00\u59cb\u9605\u8bfb\u8fd9\u4e2a\u56db\u4e2aRFC\uff0c\u8017\u65f6\u7ea62\u5c0f\u65f6\uff0c\u4e86\u89e3\u4e86\u5927\u81f4\u7684\u91cd\u4f20\u8d85\u65f6\u7b97\u6cd5\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<h3 class=\"wp-block-heading\">RFC\u4e2d\u5982\u4f55\u8ba1\u7b97RTO(Retransmission Timeout)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">RFC-793\u5982\u4f55\u8ba1\u7b97RTO<\/h4>\n\n\n\n<p>\u6982\u8ff0\uff1a\u5148\u6839\u636e\u8be5socket\u7684RTT\u8ba1\u7b97\u51faSRTT\uff08Smoothed Round Trip Time\uff09\uff0c\u7136\u540e\u6839\u636e\u4e00\u4e2a\u6700\u5927\u3001\u6700\u5c0f\u8d85\u65f6\u65f6\u95f4\u786e\u5b9a\u5f53\u524dRTO\u3002\u8bf4\u660e\uff1asrtt\u53ef\u4ee5\u7406\u89e3\u4e3a\u201c\u5e73\u6ed1\u5316\u201d\u7684RTT\uff0c\u5373\u5728\u4fdd\u6301\u8ba1\u7b97\u7b80\u5355\u7684\u60c5\u51b5\u5c3d\u91cf\u8003\u8651\u5386\u53f2RTT\u3002<\/p>\n\n\n\n<p>\u8be6\u7ec6\u8ba1\u7b97\uff1aSRTT = ( ALPHA * SRTT ) + ((1-ALPHA) * RTT)<\/p>\n\n\n\n<p>\u57fa\u4e8eSRTT\uff0c\u6211\u4eec\u518d\u6765\u8ba1\u7b97RTO\uff1aRTO = min[UBOUND,max[LBOUND,(BETA*SRTT)]]<\/p>\n\n\n\n<p>UBOUND\u662fRTO\u4e0a\u7ebf\uff0cALPHA\u662f\u5e73\u6ed1\u56e0\u5b50\uff08smoothing factor\uff0c e.g., .8 to .9\uff09\uff0cBETA\u662f\u4e00\u4e2a\u5ef6\u8fdf\u65b9\u5dee\u56e0\u5b50\uff08BETA is a delay variance factor (e.g., 1.3 to 2.0)\uff09\u3002<\/p>\n\n\n\n<p>\u4ed4\u7ec6\u770b\u8fd9\u4e24\u4e2a\u516c\u5f0f\u5927\u6982\u5c31\u80fd\u7406\u89e3\u4e86RTO\u7684\u8ba1\u7b97\u4e86\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u5bf9\u4e0a\u9762\u4e24\u4e2a\u516c\u5f0f\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u6ce8\u91ca\uff1a\u516c\u5f0f1\u4e2d\u8ba1\u7b97SRTT\uff0cALPHA\u8d8a\u63a5\u8fd1\u4e8e0\uff0c\u5219\u8868\u793aSRTT\u8d8a\u76f8\u4fe1\u8fd9\u4e00\u6b21\u7684RTT\uff1b\u8d8a\u63a5\u8fd1\u4e8e1\uff0c\u5219\u8868\u793aSRTT\u8d8a\u76f8\u4fe1\u4e0a\u6b21\u7edf\u8ba1\u7684RTT\u3002\u516c\u5f0f\u4e8c\u7ed9RTO\u5206\u522b\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u4e0a\u9650\u548c\u4e0b\u9650\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">RTO\u91cd\u4f20\u95f4\u9694\u662f\u6307\u6570\u589e\u52a0\u7684<\/h4>\n\n\n\n<p>\u4e0a\u9762\u6211\u4eec\u4ecb\u7ecd\u7684\u662f\u521d\u6b21\u91cd\u4f20\u65f6\u7684RTO\uff0c\u5982\u679c\u91cd\u4f20\u540e\u8fd8\u6ca1\u6536\u5230\u53e6\u4e00\u7aef\u7684\u54cd\u5e94\uff0c\u4e0b\u4e00\u6b21\u91cd\u4f20RTO\u5219\u4f1a\u6307\u6570\u589e\u52a0\uff0c\u4f8b\u5982\u7b2c\u4e00\u6b21\u91cd\u4f20RTO\u662f1\uff0c\u4e4b\u540e\u5206\u522b2\uff0c4\uff0c8\uff0c16&#8230;\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">RFC-2988\u548cRFC-6298\u4e2d\u7684RTO\u8ba1\u7b97<\/h4>\n\n\n\n<p>\u5728RFC-2988\u548cRFC-6298\u4e2d\u53c8\u91cd\u65b0\u6539\u8fdb\u4e86RTO\u7684\u8ba1\u7b97\u65b9\u6cd5\uff0cLinux\u4e2d\u7684\u5b9e\u73b0\u5373\u4f7f\u53c2\u8003RFC-2988\u3002\u7b97\u6cd5\u6838\u5fc3\u516c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\u521d\u59cb\uff1a\nSRTT &lt;- R\nRTTVAR &lt;- R\/2\nRTO &lt;- SRTT + max (G, K*RTTVAR)\nwhere K = 4.\n\n\u6839\u636eRTT\u8ba1\u7b97SRTT\uff1a\nRTTVAR &lt;- (1 - beta) * RTTVAR + beta * |SRTT - R'|\nSRTT &lt;- (1 - alpha) * SRTT + alpha * R'\n \n\u6700\u540eRTO\uff1a\nRTO &lt;- SRTT + max (G, K*RTTVAR)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Linux\u4e2d\u7684RTO(Retransmission Timeout)<\/h3>\n\n\n\n<p>\u8fd9\u91cc\u8bf4\u7684\u662fRHEL5.4\u76842.6.18\u5185\u6838\uff0cRFC-2988\u5b9e\u73b0\u53c2\u8003net\/ipv4\/tcp_input.c\u4e2d\u7684tcp_rtt_estimator\u548ctcp_set_rto\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u5728Linux\u4e2dalpha=1\/8\uff0cRTO\u6700\u5c0f\u4e3aTCP_RTO_MIN\u3002\u56e0\u4e3a\u6211\u4eec\u7684\u7cfb\u7edf\u4e2dRTT\u603b\u662f\u5f88\u5c0f\uff0c\u6240\u4ee5RTO\u53d6\u503c\u603b\u662f\u80fd\u591f\u53d6\u5230TCP_RTO_MIN\u3002<\/p>\n\n\n\n<p>\u5728\u770b\u770bTCP_RTO_MIN\u5728Linux\u4e2d\u7684\u5b9a\u4e49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">123 #define TCP_RTO_MAX     ((unsigned)(120*HZ))\n124 #define TCP_RTO_MIN     ((unsigned)(HZ\/5))<\/code><\/pre>\n\n\n\n<p>(\u8fd9\u91cc\u7b80\u5355\u7684\u4ecb\u7ecd\u4ecb\u7ecd\u4e00\u4e0bHZ\uff0cHZ\u53ef\u4ee5\u7406\u89e3\u4e3a1s\uff0c\u6240\u4ee5120*HZ\u5c31\u662f120\u79d2\uff0cHZ\/5\u5c31\u662f200ms\u3002\u8be6\u7ec6\u7684\uff1aHZ\u8868\u793aCPU\u4e00\u79d2\u79cd\u53d1\u51fa\u591a\u5c11\u6b21\u65f6\u95f4\u4e2d\u65ad&#8211;IRQ-0\uff0cLinux\u4e2d\u901a\u5e38\u7528HZ\u6765\u505a\u65f6\u95f4\u7247\u7684\u8ba1\u7b97\uff0c<a href=\"http:\/\/blog.csdn.net\/bdc995\/article\/details\/4144031\">\u53c2\u8003<\/a>)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5176\u4ed6\uff1aLinux\u4e2d\u53ef\u914d\u7f6e\u91cd\u4f20\u53c2\u6570<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\/proc\/sys\/net\/ipv4\/tcp_retries1 (integer; default: 3)<\/code><\/pre>\n\n\n\n<p>TCP\u5c1d\u8bd5\u4e863\u6b21\uff08tcp_retries1\u9ed8\u8ba43\uff09\u91cd\u4f20\u540e\uff0c\u8fd8\u6ca1\u6709\u6536\u5230ACK\u7684\u8bdd\uff0c\u5219\u540e\u7eed\u6bcf\u6b21\u91cd\u4f20\u90fd\u9700\u8981network layer\u5148\u66f4\u65b0\u8def\u7531\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">\/proc\/sys\/net\/ipv4\/tcp_retries2 (integer; default: 15)<\/code><\/pre>\n\n\n\n<p>TCP\u9ed8\u8ba4\u6700\u591a\u505a15\u6b21\u91cd\u4f20\u3002\u6839\u636eRTO(retransmission timeout)\u4e0d\u540c\uff0c\u6700\u540e\u4e00\u6b21\u91cd\u4f20\u95f4\u9694\u5927\u6982\u662f13\u523030\u5206\u949f\u5de6\u53f3\u3002\u5982\u679c15\u6b21\u91cd\u4f20\u90fd\u505a\u5b8c\u4e86\uff0cTCP\/IP\u5c31\u4f1a\u544a\u8bc9\u5e94\u7528\u5c42\u8bf4\uff1a\u201c\u641e\u4e0d\u5b9a\u4e86\uff0c\u5305\u600e\u4e48\u90fd\u4f20\u4e0d\u8fc7\u53bb\uff01\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6700\u540e<\/h3>\n\n\n\n<p>\u56de\u7b54\u524d\u9762\u7684\u95ee\u9898\uff1a\u5373\u4f7fRTT\u5f88\u5c0f\uff080.8ms\uff09\uff0c\u4f46\u662f\u56e0\u4e3aRTO\u6709\u4e0b\u9650\uff0c\u6700\u5c0f\u5fc5\u987b\u662f200ms\uff0c\u6240\u4ee5\u8fd9\u662fRTT\u518d\u5c0f\u4e5f\u767d\u642d\uff1bRTO\u6700\u5c0f\u503c\u662f\u5185\u6838\u7f16\u8bd1\u662f\u51b3\u5b9a\u7684\uff0csocket\u7a0b\u5e8f\u4e2d\u65e0\u6cd5\u4fee\u6539\uff0cLinux TCP\u4e5f\u6ca1\u6709\u4efb\u4f55\u53c2\u6570\u53ef\u4ee5\u6539\u53d8\u8fd9\u4e2a\u503c\u3002<\/p>\n\n\n\n<p>\u597d\u4e86\uff0c\u4e0d\u5bb9\u6613\u3002<\/p>\n\n\n\n<p>\u5e7f\u544a\uff1a<a href=\"http:\/\/www.orczhou.com\/index.php\/projects\/we-are-hunting-mysql-hacker\/\">\u6211\u4eec\u5bfb\u627e\u9760\u8c31\u7684\u4eba<\/a> | <a href=\"http:\/\/www.orczhou.com\/index.php\/wish-list\/\">\u611f\u8c22\u4f5c\u8005<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u53c2\u8003\u6587\u732e<\/h3>\n\n\n\n<p>1. RFC 1122 &#8230; (<a href=\"http:\/\/www.ietf.org\/rfc.html\">\u5728\u54ea\u513f\u67e5\u627eRFC<\/a>) TCP\u534f\u8bae\u76f8\u5173\u7684RFC\uff1a<br>RFC 675 &#8211; Specification of Internet Transmission Control Program, December 1974 Version<br>RFC 793 &#8211; TCP v4<br>RFC 1122 &#8211; includes some error corrections for TCP<br>RFC 1323 &#8211; TCP-Extensions<br>RFC 1379 &#8211; Extending TCP for Transactions\u2014Concepts<br>RFC 1948 &#8211; Defending Against Sequence Number Attacks<br>RFC 2018 &#8211; TCP Selective Acknowledgment Options<br>RFC 2988 &#8211; Computing TCP&#8217;s Retransmission Timer<br>RFC 4614 &#8211; A Roadmap for TCP Specification Documents<br>RFC 5681 &#8211; TCP Congestion Control<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0\uff1a\u672c\u6587\u8ba8\u8bba\u4e3b\u673a\u5728\u53d1\u9001\u4e00\u4e2aTCP\u6570\u636e\u5305\u540e\uff0c\u5982\u679c\u8fdf\u8fdf\u6ca1\u6709\u6536\u5230ACK\uff0c\u4e3b\u673a\u591a\u4e45\u540e\u4f1a\u91cd\u4f20\u8fd9\u4e2a\u6570\u636e\u5305\u3002\u4e3b\u673a\u4ece\u53d1\u51fa\u6570\u636e\u5305\u5230\u7b2c\u4e00\u6b21TCP\u91cd\u4f20\u5f00\u59cb\uff0cRFC\u4e2d\u8fd9\u6bb5\u65f6\u95f4\u95f4\u9694\u79f0\u4e3aretransmission timeout\uff0c\u7f29\u5199\u505aRTO\u3002\u672c\u6587\u4f1a\u5148\u770b\u770bRFC\u4e2d\u5982\u4f55\u5b9a\u4e49RTO\uff0c\u7136\u540e\u770b\u770bLinux\u4e2d\u5982\u4f55\u5b9e\u73b0\u3002\u672c\u6587\u65e8\u5728\u5206\u4eab\uff1a\u5f53\u9047\u5230\u4e86TCP\u5c42\u95ee\u9898\u6539\u5982\u4f55\u53bb\u67e5\u627e\u3001\u9605\u8bfb\u6587\u6863\uff0c\u8be5\u5982\u4f55\u53bb\u5728Linux\u6e90\u7801\u4e2d\u5bfb\u6c42\u7b54\u6848\u3002 \u8d77\u6e90 \u5728\u5206\u6790MySQL 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