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Message-ID: <7e63f56c0704272143s677cdad8rcf64d1e97d88fc40@mail.gmail.com> Date: Sat, 28 Apr 2007 06:43:00 +0200 From: "Robert Iakobashvili" <coroberti@...il.com> To: "Quan Sun" <cfk.quan@...il.com> Cc: netdev@...r.kernel.org Subject: Re: Slow tcp handshakes rate of 2.6.20 and 2.6.19 On 4/28/07, Quan Sun <cfk.quan@...il.com> wrote: > Hi, > In these days I met a strange situation, tcp handshake rate is > slow after 2.6.18.8. > > The case is, server accepts connections, and records number of successful > tcp handshakes during last 10 seconds. Client tries to connect to server's > listen port as fast as possible and as many as possible, or in simple words, > client use connect() to flood the server. In both cases, there are a log of syn > re-send. > > Server's performances varied much, depending on which kernel it was > running. On 2.6.18.8, 10000 successful connections take about 30-40 seconds, > while on 2.6.20 or 2.6.19, it will cost about more than 5 minutes. Please, look at this by pressing next_in_thread: http://marc.info/?l=linux-netdev&m=117664202416020&w=2 What are the #cat /proc/sys/net/ipv4/tcp_mem values for your kernels? Do you see tcp memory pressure by #netstat -s ? Sincerely, Robert Iakobashvili, coroberti %x40 gmail %x2e com ................................................................... Navigare necesse est, vivere non est necesse ................................................................... http://curl-loader.sourceforge.net An open-source HTTP/S, FTP/S traffic generating, and web testing tool. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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