Message-Id: <201009080055.16598.Martin@lichtvoll.de>
Date:	Wed, 8 Sep 2010 00:55:08 +0200
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Bisecting radeon kms freeze bug: Almost there, please help with choosing next commit

Am Dienstag 07 September 2010 schrieb Alex Deucher:
> On Tue, Sep 7, 2010 at 10:34 AM, Martin Steigerwald 
<Martin@...htvoll.de> wrote:
> > Hello Alex and und Dave,
> > 
> > please excuse typing errors. The machine is abysmally slow with that
> > kernel.
> > 
> > I am almost there with bisecting Bug 16376, random - possibly Radeon
> > DRM KM related - freezes. I think I found the merge where is issue
> > has been introduced and I am now testing
> > 
> > martin@...mbhala:~/Computer/Shambhala/Kernel/2.6.33-2.6.34-
> > bisect/linux-2.6> git log | head
> > commit 6ad86c311a8b8a6d856527a1b6ba21790ab7054b
> > Author: Alex Deucher <alexdeucher@...il.com>
> > Date:   Thu Feb 11 10:47:52 2010 -0500
> > 
> >    drm/radeon/kms: remove HDP flushes from fence emit (v2)
> > 
> >    r600_ioctl_wait_idle() now handles this.
> > 
> >    v2: update blit fence counts
> > 
> > Unfortunately it has some other issues that has been fixed later on
> > prior to 2.6.34 already:
> > 
> > 7.9.2010 - 2.6.32-tp42-00514-g6ad86c3
> > 6ad86c311a8b8a6d856527a1b6ba21790ab7054b
> > - Sluggy desktop. Short pauses, locks of about a second.
> > - Slow scroll performance on tty.
> > - No complete freeze yet.
> > - Much CPU time used in system:70-90%
> > 
> > You know the changes in that merge better than me. Can you recommend
> > which commits to test next? Som commits may require other ones and
> > thus it might be wise to choose the next commits with that in mind.
> > Maybe you already have an idea which one it could be. I thought
> > about the memory controllr v2 changes, but I really don't have the
> > foggiest.
> 
> This might be a duplicate of:
> https://bugs.freedesktop.org/show_bug.cgi?id=28402
> Does the patch there help?

Which of the patches mentioned in the bug report?

The ones mentioned in:

https://bugs.freedesktop.org/show_bug.cgi?id=28402#c44

Or your patch from

https://bugs.freedesktop.org/show_bug.cgi?id=28402#c47

?

I am already testing the next bisect kernel and I am quite close 10-15 
commits in exactly the area described in the bug report. If 
30d6c72c4a760cfc9069ee100786e4d6cf6de59d turns out to be good, like it 
seems, then the issue must have been introduced between it and the sluggy 
6ad86c311a8b8a6d856527a1b6ba21790ab7054b mentioned below.

Thanks,
Martin

> Alex
> 
> > Here is excerpt from atop which shows ridicully high system CPU usage
> > with that kernel.
> > 
> > ATOP - shambhala          2010/09/07  16:11:22               10
> > seconds elapsed
> > PRC | sys   8.66s | user   1.30s | #proc    195 | #zombie    0 |
> > #exit 0 |
> > CPU | sys     85% | user     11% | irq       4% | idle      0% | wait
> > 0% |
> > CPL | avg1   3.39 | avg5    3.80 | avg15   3.25 | csw    18458 | intr
> > 11472 |
> > MEM | tot    2.0G | free  543.1M | cache 759.6M | buff   95.0M | slab
> > 37.8M |
> > SWP | tot    3.8G | free    3.8G |              | vmcom   1.3G |
> > vmlim 4.8G |
> > DSK |         sda | busy      3% | read       1 | write     95 | avio
> >    2 ms |
> > 
> > I wrote by mail since bugzilla has too many MySQL connections again.
> > Maybe bug can be switched to mail?
> > 
> > Rebooting and testing this kernel another time whether it hard
> > freezes, --
> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> > GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7


-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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