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Date: Thu, 1 Nov 2007 21:03:33 +0800
From: Fengguang Wu <wfg@mail.ustc.edu.cn>
To: Florin Iucha <florin@iucha.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Trond Myklebust <trond.myklebust@fys.uio.no>,
       Peter Zijlstra <peterz@infradead.org>
Subject: Re: pdflush stuck in D state with v2.6.24-rc1-192-gef49c32
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On Thu, Nov 01, 2007 at 07:25:58AM -0500, Florin Iucha wrote:
> On Thu, Nov 01, 2007 at 03:15:32PM +0800, Fengguang Wu wrote:
> > On Wed, Oct 31, 2007 at 12:53:18PM -0500, Florin Iucha wrote:
> > > This patch does not fix anything for me.  Even such light use of the
> > > reiserfs filesystem as pulling the linux-2.6 git tree updates caused
> > > one CPU to go to 75% iowait.
> >  
> > Thank you, Florin. Could you provide more details about sda7, such as
> > the mount option and output of `reiserfstune /dev/sda7`? I'll try to
> > reproduce it before asking for your help.
> 
> Fengguang,
> 
> root@zeus:~# mount | grep sda7
> /dev/sda7 on /scratch type reiserfs (rw,noatime)
> root@zeus:~# df -h /scratch/
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda7              38G   32G  5.7G  85% /scratch
[...]

Thank you. It seems the only difference with mine reiserfs is about
the 'noatime' - which I tried and saw no difference.

Or will the system or fs size/age make any difference? If you happen
to have a spare/swap partition, could you make a new reiserfs and
mount it and copy several less-than-4KB files into it and wait for 30s
and see what happen to pdflush?

btw, what's the exact kernel version you are running?

Thank you,
Fengguang