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

[bugzilla-daemon@bugzilla.kernel.org]

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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