linux-kernel - Re: bad networking related lag in v2.6.22-rc2

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Message-ID: <20070521102009.GA12196@elte.hu>
Date:	Mon, 21 May 2007 12:20:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Anant Nitya <kernel@...chanda.info>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: bad networking related lag in v2.6.22-rc2

* Anant Nitya <kernel@...chanda.info> wrote:

> Tcp:
>     5 connections established

hm, this does not explain the /proc/net/tcp overhead i think - although 
it could be a red herring. Will have a closer look at your new trace. 

if possible please try to generate the automatic softirq trace for 
Thomas, and then a separate trace for the firefox/net-lag thing, using 
trace-it-10sec.c. Btw., for the second trace, could you boot with 
maxcpus=1? That would make the second trace quite a bit more 
straightforward to analyze. You probably need both cpus to trigger the 
softirq problem.

	Ingo
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