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

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Date:	Wed, 9 Jan 2008 14:04:29 +0100
From:	Joerg Platte <lists@...sa.net>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: regression: 100% io-wait with 2.6.24-rcX

Am Mittwoch, 9. Januar 2008 schrieb Fengguang Wu:
> On Wed, Jan 09, 2008 at 01:22:33PM +0100, Joerg Platte wrote:
> > Am Mittwoch, 9. Januar 2008 schrieb Fengguang Wu:
> >
> > Thank your for the hint with the filesystems!
> >
> > > Thank you for the clue. However I cannot reproduce the bug on
> > > ext2/2.6.24-rc7. Can you provide more details? Thank you.
> >
> > I attached some more information. I'm using the ata_piix driver for my
> > PATA disk and cdrom drive and booted with hpet=force. Kernel 2.6.23.X has
> > been
>
>                                                           ~~~~~~~~
> 							  not 2.6.24-rc7?
>
No, 2.6.23.X was the last working kernel without this problem, the bug shows 
up with 2.6.24-rcX. I just wanted to emphasis, that I don't think that it has 
something to do with the hpet stuff. Kernel 2.6.24-rcX is unpatched, because 
the hrt stuff has been merged.

> > patched with the -hrt patches to enable the hidden hpet time on the
> > ICH4-M chipset. I just rebooted the notebook and mounted /tmp again as
> > ext2 and now the iowait problem is back. Seems to be reproducible on my
> > computer. What additional information do you need?
>
> I mounted an ext2 as tmp and find no problem. My config options are:
>
> CONFIG_EXT2_FS=y
> CONFIG_EXT2_FS_XATTR=y
> CONFIG_EXT2_FS_POSIX_ACL=y
> CONFIG_EXT2_FS_SECURITY=y
> # CONFIG_EXT2_FS_XIP is not set
>
> Fengguang

CONFIG_EXT2_FS=m
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
CONFIG_EXT2_FS_SECURITY=y
CONFIG_EXT2_FS_XIP=y

Here it is modular and I enabled CONFIG_EXT2_FS_XIP, but the same is enabled 
on 2.6.23.X. Maybe it is related to libata? I additionally discovered, that 
the problem disappears for a few seconds when I press the eject button for 
the ultra bay of my thinkpad. Pressing the button unregisters the cdrom drive 
to be able to replace it with a hard drive or a battery. Maybe this bug is 
thinkpad relared?

regards,
Jörg

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