Date: Mon, 21 May 2007 12:20:09 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Anant Nitya <kernel@prachanda.info>
Cc: linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       "David S. Miller" <davem@davemloft.net>
Subject: Re: bad networking related lag in v2.6.22-rc2
Message-ID: <20070521102009.GA12196@elte.hu>
References: <20070517174533.GA538@elte.hu> <20070521080351.GA13375@elte.hu> <20070521081201.GB13858@elte.hu> <200705211544.58018.kernel@prachanda.hub>
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* Anant Nitya <kernel@prachanda.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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