Date: Wed, 1 Mar 2006 02:22:35 -0800
From: Andrew Morton <akpm@osdl.org>
To: Max Kellermann <max@duempel.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.16-rc[1-5]: soft lockups on Athlon64 X2
Message-Id: <20060301022235.51f47b42.akpm@osdl.org>
In-Reply-To: <20060301100744.GA1041@roonstrasse.net>
References: <20060227122705.GA27141@roonstrasse.net>
	<20060228221948.3d76f80b.akpm@osdl.org>
	<20060301100744.GA1041@roonstrasse.net>
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Max Kellermann <max@duempel.org> wrote:
>
> On 2006/03/01 07:19, Andrew Morton <akpm@osdl.org> wrote:
> > Strange.  I did remove a cond_resched() from
> > invalidate_mapping_pages() so that it could be run under spinlock
> > but I cannot believe that you had so many pages cached that the
> > invalidate took more than ten seconds.
> > 
> > Does the machine recover and otherwise work OK?
> 
> The mount indeed took more than ten (wallclock) seconds during which
> the lockups occured, and after that it seemed usable (I rebooted
> shortly after because I feared fs corruption).  Normally, this mount
> takes 2 seconds or so - it's a crypted 200GB XFS partition.  The same
> goes for the "bugged" kernel with "nosmp": mount is finished quickly.
> 

How is it encrypted?   (With which kernel encryption stuff?)

I guess it'd be useful to see where all that time is spent, if you have
time.   Enable CONFIG_PROFILING, boot with `profile=1', do:

readprofile -r
mount ...
readprofile -n -v -m /boot/System.map | sort -n -k 3 | tail -40

(Make sure it's the correct System.map).
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