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Message-ID: <456E196E.2080802@mbligh.org> Date: Wed, 29 Nov 2006 15:36:14 -0800 From: Martin Bligh <mbligh@...igh.org> To: wenji@...l.gov Cc: netdev@...r.kernel.org, davem@...emloft.net, akpm@...l.org, linux-kernel@...r.kernel.org Subject: Re: [Changelog] - Potential performance bottleneck for Linxu TCP Wenji Wu wrote: > From: Wenji Wu <wenji@...l.gov> > > Greetings, > > For Linux TCP, when the network applcaiton make system call to move data > from > socket's receive buffer to user space by calling tcp_recvmsg(). The socket > will > be locked. During the period, all the incoming packet for the TCP socket > will go > to the backlog queue without being TCP processed. Since Linux 2.6 can be > inerrupted mid-task, if the network application expires, and moved to the > expired array with the socket locked, all the packets within the backlog > queue > will not be TCP processed till the network applicaton resume its execution. > If > the system is heavily loaded, TCP can easily RTO in the Sender Side. So how much difference did this patch actually make, and to what benchmark? > The patch is for Linux kernel 2.6.14 Deskop and Low-latency Desktop The patch oesn't seem to be attached? Also, would be better to make it for the latest kernel version (2.6.19) ... 2.6.14 is rather old ;-) M - 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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