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

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Message-Id: <20070521.012903.18300561.davem@davemloft.net>
Date:	Mon, 21 May 2007 01:29:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	kernel@...chanda.info, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	tglx@...utronix.de
Subject: Re: bad networking related lag in v2.6.22-rc2

From: Ingo Molnar <mingo@...e.hu>
Date: Mon, 21 May 2007 10:12:01 +0200

> and ... you already did a trace for Thomas, for the softirq problem:
> 
>    http://cybertek.info/taitai/trace.txt.bz2
> 
> this trace shows really bad networking related kernel activities!
> 
> gkrellm-5977 does this at timestamp 0:
> 
>  gkrellm-5977  0..s.    0us : cond_resched_softirq (established_get_next)

So it's not the 3c59x bug :-)

If you have a lot of sockets, there is not way to make
the performance of dumping /proc/net/tcp not suck, use
the netlink socket dumping which is:

1) more efficient even for full dumps
2) allows filtering for the best possible performance
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