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	<title>臭皮匠 &#187; sysctrl</title>
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		<title>优化web服务器tcp半连接</title>
		<link>http://guogoul.com/2009/06/23/tcp_tw_reuse/</link>
		<comments>http://guogoul.com/2009/06/23/tcp_tw_reuse/#comments</comments>
		<pubDate>Tue, 23 Jun 2009 15:46:43 +0000</pubDate>
		<dc:creator>john</dc:creator>
				<category><![CDATA[Web开发]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[sysctrl]]></category>

		<guid isPermaLink="false">http://john.renren.in/?p=116</guid>
		<description><![CDATA[在繁忙的web服务器上,很常见的问题是大量tcp 半连接的存在占用系统的大量资源。有效的减少半连接对优化服务器响应有着重要的作用。
实践步骤：
1。执行 /bin/netstat -n &#124; awk &#8216;/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}&#8217;
2。vi /etc/sysctl.conf   添加如下两行:

1)net.ipv4.tcp_tw_reuse = 1     //允许将TIME-WAIT sockets重新用于新的TCP连接
2)net.ipv4.tcp_tw_recycle = 1  //开启TCP连接中TIME-WAIT sockets的快速回收

3。运行sysctl -p

4。执行 /bin/netstat -n &#124; awk &#8216;/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}&#8217;
如果对于TIME_WAIT较高的服务器来说应该很快就会看到效果
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