[Bug 15328] New: high load avg, extreme sluggishness on T41 w/ Radeon Mobility M7

[Bug 15328] New: high load avg, extreme sluggishness on T41 w/ Radeon Mobility M7

[bugzilla-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=15328

           Summary: high load avg, extreme sluggishness on T41 w/ Radeon
                    Mobility M7
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.33-rc8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: linville@tuxdriver.com
                CC: thellstrom@vmware.com
        Regression: Yes


After loading a recent wireless-testing kernel (based on 2.6.33-rc8) on my T41
I noticed an unacceptabel sluggishness.  Opening gnome-terminal took a long
time, firefox took so long I rebooted before it ever came-up, etc.  The w
command continually reported a load average for between 2 and 3 on an
apparently idle box.

A git bisect session identified this patch:

commit db78e27de7e29a6db6be7caf607cf803d84094aa
Author: Francisco Jerez <currojerez@riseup.net>
Date:   Tue Jan 12 18:49:43 2010 +0100

    drm/ttm: Avoid conflicting reserve_memtype during ttm_tt_set_page_caching.

    Fixes errors like:
    > reserve_ram_pages_type failed 0x15b7a000-0x15b7b000, track 0x8, req 0x10
    when a BO is moved between WC and UC areas.

    Reported-by: Xavier Chantry <shiningxc@gmail.com>
    Signed-off-by: Francisco Jerez <currojerez@riseup.net>
    Acked-by: Thomas Hellstrom <thellstrom@vmware.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

Just to verify, I sent back to my wireless-testing tree and reverted that
patch.  This restored normal/acceptable performance.

If you need/want testing or whatnot just let me know...

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Xavier Chantry <chantry.xavier@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chantry.xavier@gmail.com




--- Comment #1 from Xavier Chantry <chantry.xavier@gmail.com>  2010-02-16 20:36:49 ---
It was also reported here :
http://www.mail-archive.com/dri-devel@lists.sourceforge.net/msg47164.html

I asked curro about it but he had no idea :
17:13 < shining> curro__: did you see "Problem with drm-radeon-testing commit -
drm/ttm: Avoid conflicting reserve_memtype during ttm_tt_set_page_caching." ?
17:20 < curro__> shining: not sure about that

It seems to be an issue only for few radeon users.

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--- Comment #2 from John W. Linville <linville@tuxdriver.com>  2010-02-16 20:43:30 ---
Definitely the same commit, and sounds more-or-less like the same problem. 
Although in the report above it doesn't sound that terrible whereas on this T41
(single 1.6GHz i686) it cripples the box.

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--- Comment #3 from Thomas Hellstrom <thellstrom@vmware.com>  2010-02-16 21:24:27 ---
Really, The Radeon driver *should* never change caching policy from WC to UC,
and thus never hit the code path affected by that patch. However if it does,
and particularly if it does frequently it's quite natural that the patch causes
severe CPU overhead since transition from WC->WB->UC causes a cache flush
whereas WC->UC doesn't.

Maybe Jerome has some input?

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--- Comment #4 from John W. Linville <linville@tuxdriver.com>  2010-02-17 22:06:22 ---
I have no idea at to how serious a problem the commit fixed.  But I know it is
causing a serious problem on my T41.  Maybe I'm wrong, but I don't get the
feeling that the patch author is too interested in fixing the problem his patch
created.  Since we are late in the 2.6.33 cycle, I would prefer to see this
reverted under the "we don't exchange one bug for another" policy.

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Pauli <suokkos@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |suokkos@gmail.com




--- Comment #5 from Pauli <suokkos@gmail.com>  2010-02-17 22:25:34 ---
(In reply to comment #4)
> I have no idea at to how serious a problem the commit fixed.  But I know it is
> causing a serious problem on my T41.  Maybe I'm wrong, but I don't get the
> feeling that the patch author is too interested in fixing the problem his patch
> created.  Since we are late in the 2.6.33 cycle, I would prefer to see this
> reverted under the "we don't exchange one bug for another" policy.

Does your kernel have PAT enabled?

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--- Comment #6 from bjaglin <bjaglin@free.fr>  2010-02-18 01:59:51 ---
Same problem here on a T40 (Radeon 9000 - RV250), extremely sluggish for
>=2.6.33-rc7. Reverting the commit mentioned above seems to fix the problem.

If that's what you are asking, cat /proc/cpuinfo does not show "pat" as a flag
on my Pentium M (SL7EG).

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Jérôme Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glisse@freedesktop.org




--- Comment #7 from Jérôme Glisse <glisse@freedesktop.org>  2010-02-18 15:44:56 ---
Yes, radeon is wrong, i am tracking down why we are doing WC -> UC or UC -> WC

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--- Comment #8 from Jérôme Glisse <glisse@freedesktop.org>  2010-02-18 17:02:45 ---
Ok so it's more likely because on non PAT get_page_memtype always return -1
thus we always do set_wb and if page were already wb it likely kill perf. I
don't think we ever do WC -> UC or UC -> WC.

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--- Comment #9 from Francisco Jerez <currojerez@riseup.net>  2010-02-18 18:53:42 ---
Created an attachment (id=25107)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25107)
ttm_set_caching_nopat.patch

I guess the attached patch fixes it. However it might make sense to fix the PAT
code instead because this interface is somewhat annoying.

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Francisco Jerez <currojerez@riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |currojerez@riseup.net




--- Comment #10 from Francisco Jerez <currojerez@riseup.net>  2010-02-18 19:14:55 ---
BTW, sorry for not taking care of this before.

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--- Comment #11 from John W. Linville <linville@tuxdriver.com>  2010-02-19 14:23:30 ---
Sorry for the delay...

CONFIG_X86_PAT=y

Building w/ patch from comment 9 now.

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--- Comment #12 from John W. Linville <linville@tuxdriver.com>  2010-02-19 15:00:57 ---
Yup, that looks good...thanks!

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Francisco Jerez <currojerez@riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #25107|0                           |1
        is obsolete|                            |




--- Comment #13 from Francisco Jerez <currojerez@riseup.net>  2010-02-19 16:48:47 ---
Created an attachment (id=25118)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25118)
ttm_set_caching_nopat_2.patch

This patch uses a simpler approach, would you mind checking that it has the
same effect?

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--- Comment #14 from John W. Linville <linville@tuxdriver.com>  2010-02-19 18:47:23 ---
The patch from comment 13 is acceptable, but my "seat of the pants" feeling is
that the first patch performed better.  FWIW the load average seemed 20-30%
lower with the first patch too, but I didn't do exhaustive testing by any
means.

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Tobias Jakobi <liquid.acid@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |liquid.acid@gmx.net




--- Comment #15 from Tobias Jakobi <liquid.acid@gmx.net>  2010-02-19 22:35:26 ---
I'm experiencing similar problems on my RV740 which is hooked up through the
PCIe.

I first noticed the issue when updating drm-radeon-testing and
mesa+xf86-video-ati+libdrm to git master.

I'm now using the latest drm-linus branch, which should fix this problem - but
apparantly not for me. Maybe it's just similar...

Anyway, I now have a average performance of 4fps in CS 1.5. The funny thing is
that quake3 is running with around 300fps when not limiting the fps. However
that's the only application I have currently installed that does that. Every
other OpenGL game I tested slows down to a crawl.

I also tried both patches here on drm-radeon-testing prior to checking out
drm-linus. Applying them there makes no difference to the performance.

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--- Comment #16 from Francisco Jerez <currojerez@riseup.net>  2010-02-19 22:49:18 ---
(In reply to comment #15)
> I'm experiencing similar problems on my RV740 which is hooked up through the
> PCIe.
> 
> I first noticed the issue when updating drm-radeon-testing and
> mesa+xf86-video-ati+libdrm to git master.
> 
> I'm now using the latest drm-linus branch, which should fix this problem - but
> apparantly not for me. Maybe it's just similar...
> 
> Anyway, I now have a average performance of 4fps in CS 1.5. The funny thing is
> that quake3 is running with around 300fps when not limiting the fps. However
> that's the only application I have currently installed that does that. Every
> other OpenGL game I tested slows down to a crawl.
> 
> I also tried both patches here on drm-radeon-testing prior to checking out
> drm-linus. Applying them there makes no difference to the performance.

Have you tried reverting db78e27de7e2?

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--- Comment #17 from Tobias Jakobi <liquid.acid@gmx.net>  2010-02-19 23:36:50 ---
I get an error with git when trying to revert the commit, so I just tried the
two patches.

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--- Comment #18 from Francisco Jerez <currojerez@riseup.net>  2010-02-19 23:44:25 ---
(In reply to comment #17)
> I get an error with git when trying to revert the commit, so I just tried the
> two patches.

You'll need to revert f0e2f38befa7 first.

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--- Comment #19 from Tobias Jakobi <liquid.acid@gmx.net>  2010-02-19 23:49:06 ---
I just went back to commit db78e27de7e2 and reverted then - I'm now building
that tree. Reporting back once I've done some tests.

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--- Comment #20 from Tobias Jakobi <liquid.acid@gmx.net>  2010-02-20 00:03:17 ---
No, nothing - doesn't have any effect on performance. Must be something else.
I'm still wondering though since I already went back several weeks in git with
xf86-video-ati, libdrm and mesa and the problem still occurs... have to think
about what I updated in the past. :(

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |rjw@sisk.pl
             Blocks|                            |14885
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #21 from Rafael J. Wysocki <rjw@sisk.pl>  2010-02-22 21:42:00 ---
Patch : http://bugzilla.kernel.org/attachment.cgi?id=25118
Handled-By : Francisco Jerez <currojerez@riseup.net>

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