linux-kernel - Re: regression: 100% io-wait with 2.6.24-rcX

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Message-ID: <20080107111930.GB29973@elte.hu>
Date:	Mon, 7 Jan 2008 12:19:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	jplatte@...sa.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: regression: 100% io-wait with 2.6.24-rcX


* Joerg Platte <lists@...sa.net> wrote:

> Hi,
> 
> when booting kernel 2.6.24-rc{4,5,6,7} top reports up to 100% iowait, 
> even if no program accesses the disc on my Thinkpad T40p. Kernel 
> 2.6.23.12 does not suffer from this. Is there anything I can do to 
> find out which process or which part of the kernel is responsible for 
> this? I can try to bisect it, but maybe there are other possibilities 
> to debug this, since I cannot boot this computer frequently. I 
> discovered, that there is no iowait within the first few seconds after 
> waking up from suspend to ram...

do:

  echo t > /proc/sysrq-trigger

and send us the dmesg output. If the dmesg output does not include the 
bootup bits then increase CONFIG_LOG_BUF_SHIFT to 20 or so:

  CONFIG_LOG_BUF_SHIFT=20

to have a large enough kernel messages buffer.

	Ingo
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