Date: Wed, 17 Nov 2004 15:55:06 +1100
From: Nathan Scott <nathans@sgi.com>
To: Brad Fitzpatrick <brad@danga.com>, Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, lisa@danga.com, marksmith@danga.com,
       linux-xfs@oss.sgi.com
Subject: Re: 2.6.9: unkillable processes during heavy IO
Message-ID: <20041117045506.GA1802@frodo>
References: <Pine.LNX.4.58.0411141403040.22805@danga.com> <Pine.LNX.4.58.0411160549070.7904@danga.com> <20041116200156.2b2526e5.akpm@osdl.org>
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On Tue, Nov 16, 2004 at 08:01:56PM -0800, Andrew Morton wrote:
> Brad Fitzpatrick <brad@danga.com> wrote:
> >
> > Here is the information requested regarding the regular lockup we're
> > seeing (details in original post at bottom)
> 
> yup, that looks like a locking tangle in the XFS direct-io code.
> 
> Nathan, this is 2.6.9.

Hmmm, yeah, looks like it - bother.  

> > On Sun, 14 Nov 2004, Brad Fitzpatrick wrote:
> > 
> > > We have two database servers which freeze up during heavy IO load.  The

Brad, could you send me details on how you've setup mysqld
and how to generate a load similar to yours, so that I can
reproduce the hang locally?

> > > The hardware/software stack is:
> > >
> > >   - Dual Opteron 246, SMP kernel, w/ NUMA
> > >   - 9 GB of memory (4GB in one zone, 5GB in the other)
> > >   - MySQL, running mostly InnoDB, but some MyISAM

( I don't even know what those two things are, so you can
probably guess at the level of assistance I'll need here. :)

thanks!

-- 
Nathan
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