netdev - Re: [Changelog] - Potential performance bottleneck for Linxu TCP

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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
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