linux-kernel - Re: Bisecting radeon kms freeze bug: Almost there, please help with choosing next commit

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Message-ID: <AANLkTimiVkOYeGRLiEXMxoo6NX8LeeDMB6Eyck26h1Ns@mail.gmail.com>
Date:	Wed, 8 Sep 2010 02:43:55 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Martin Steigerwald <Martin@...htvoll.de>
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

On Tue, Sep 7, 2010 at 6:55 PM, Martin Steigerwald <Martin@...htvoll.de> wrote:
> 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 originally meant my patch in comment 47, but you might as well try
both (separately).

Alex

>
> 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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