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    <p>Out of the box, windows needs some tweeking. I had to implement a comet server in asp.net and ran into some silly defaults. After reading these links:</p> <ul> <li><a href="https://stackoverflow.com/questions/612242/iis-7-0-503-errors-with-generic-handler-ashx-implementing-ihttpasynchandler">IIS 7.0 503 errors with generic handler (.ashx) implementing IHttpAsyncHandler</a></li> <li><a href="http://blogs.technet.com/b/winserverperformance/archive/2008/07/25/tuning-windows-server-2008-for-php.aspx" rel="nofollow noreferrer">http://blogs.technet.com/b/winserverperformance/archive/2008/07/25/tuning-windows-server-2008-for-php.aspx</a></li> <li><a href="http://smallvoid.com/article/winnt-tcpip-max-limit.html" rel="nofollow noreferrer">http://smallvoid.com/article/winnt-tcpip-max-limit.html</a></li> <li><a href="http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.express.doc/info/exp/ae/rprf_plugin.html" rel="nofollow noreferrer">http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.express.doc/info/exp/ae/rprf_plugin.html</a></li> <li><a href="http://support.microsoft.com/kb/820129" rel="nofollow noreferrer">http://support.microsoft.com/kb/820129</a> </li> <li><a href="http://msdn.microsoft.com/en-us/library/ee37705(BTS.10).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ee37705(BTS.10).aspx</a></li> <li><a href="http://blogs.msdn.com/b/tmarq/archive/2007/07/21/asp-net-thread-usage-on-iis-7-0-and-6-0.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/b/tmarq/archive/2007/07/21/asp-net-thread-usage-on-iis-7-0-and-6-0.aspx</a></li> </ul> <p>I came up with the following changes that were made to our windows 2k8 server.</p> <ul> <li>reg add HKLM\System\CurrentControlSet\Services\HTTP\Parameters /v MaxConnections /t REG_DWORD /d 1000000 /f</li> <li>reg add HKLM\System\CurrentControlSet\Services\TcpIp\Parameters /v TcpTimedWaitDelay /t REG_DWORD /d 30 /f</li> <li>reg add HKLM\SOFTWARE\Microsoft\ASP.NET\2.0.50727.0 /v MaxConcurrentThreadsPerCPU /t REG_DWORD /d 0 /f</li> <li>reg add HKLM\SOFTWARE\Microsoft\ASP.NET\2.0.50727.0 /v MaxConcurrentRequestsPerCPU /t REG_DWORD /d 30000 /f</li> <li>appcmd.exe set apppool "[app pool name]" /queueLength:65535</li> <li>appcmd.exe set config /section:serverRuntime /appConcurrentRequestLimit:100000</li> <li>reg add HKLM\System\CurrentControlSet\Services\TcpIp\Parameters /v MaxUserPort /t REG_DWORD /d 65534 /f</li> <li>reg add HKLM\System\CurrentControlSet\Services\TcpIp\Parameters /v MaxFreeTcbs /t REG_DWORD /d 2000 /f</li> <li>reg add HKLM\System\CurrentControlSet\Services\TcpIp\Parameters /v MaxHashTableSize /t REG_DWORD /d 2048 /f reg add HKLM\System\CurrentControlSet\Services\InetInfo\Parameters /v MaxPoolThreads /t REG_DWORD /d 80 /f</li> <li>appcmd set config /section:processModel /requestQueueLimit:100000 /commit:MACHINE</li> </ul> <p>I don't know if all the changes were required or optimal, but with some quik tesing against a test server, we achived over 30k executing connections and 5k requests per second. Couldn't go further because i ran out of client machines to run the tests from.</p>
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