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

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Date:	Wed, 9 Jan 2008 20:04:58 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	jplatte@...sa.net
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

On Wed, Jan 09, 2008 at 07:13:14AM +0100, Joerg Platte wrote:
> Am Mittwoch, 9. Januar 2008 schrieb Fengguang Wu:
> > > /dev/sda6 on / type ext3 (rw,noatime,errors=remount-ro,acl)
> > > tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
> > > proc on /proc type proc (rw,noexec,nosuid,nodev)
> > > sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> > > procbususb on /proc/bus/usb type usbfs (rw)
> > > udev on /dev type tmpfs (rw,mode=0755)
> > > tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
> > > devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
> > > fusectl on /sys/fs/fuse/connections type fusectl (rw)
> > > /dev/sda7 on /tmp type ext2 (rw,noatime,errors=remount-ro,acl)
> > > /dev/sda8 on /export type ext3 (rw,noatime,errors=remount-ro,acl)
> > > /dev/sda1 on /winxp type ntfs (rw,umask=002,gid=10000,nls=utf8)
> >
> > So they are ext3/ext2/ntfs.  What if you umount ntfs? and ext2 if possible?
> 
> Unmounting ntfs doesn't help, hence I converted the remaining ext2 filesystem 
> to ext3, modified the fstab entry accordingly and rebooted. Now everything 
> seems to be fine! Top reports an idle system and there is no abnormal iowait 
> any longer! Seems to be ext2 was causing this! Later today I can try to 
> remount the filesystem as ext2 to be sure the bug shows up again.

Thank you for the clue. However I cannot reproduce the bug on
ext2/2.6.24-rc7. Can you provide more details? Thank you.

Fengguang

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