[Bugme-new] [Bug 10592] New: [old regression] performance drop for glx after vblank patch

bugme-daemon at bugzilla.kernel.org bugme-daemon at bugzilla.kernel.org
Fri May 2 10:36:33 PDT 2008


http://bugzilla.kernel.org/show_bug.cgi?id=10592

           Summary: [old regression] performance drop for glx after vblank
                    patch
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.20-2.6.25
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: bug-track at fisher-privat.net


Latest working kernel version:2.6.19
Earliest failing kernel version:2.6.20
Distribution:ubuntu 8.04
Hardware Environment:ASUS P5LD2-VM ( video i945g , Pentium D ) 
Software Environment:
Problem Description:


This is old regression. Tested with glxgears i get this results:
v2.6.19     _1413.112_FPS_
v2.6.20      1280.060 FPS  
v2.6.22      1300.116 FPS
v2.6.24      1205.895 FPS
v2.6.25-git* 1226.967 FPS


Thirst regression was pasebly introduced by vblank patch in i915:
commit ee2fae03d68e702866a8661fbee7ff2f2f3754d7
Merge: e4ddc9c... f9841a8...
Author: Linus Torvalds <torvalds at woody.osdl.org>
Date:   Wed Dec 20 23:59:07 2006 -0800

    Merge branch 'drm-patches' of
master.kernel.org:/pub/scm/linux/kernel/git/ai

    * 'drm-patches' of
master.kernel.org:/pub/scm/linux/kernel/git/airlied/drm-2
      drm: Stop defining pci_pretty_name
      drm: r128: comment aligment with drm git
      drm: make kernel context switch same as for drm git tree.
      drm: fixup comment header style
      drm: savage: compat fix from drm git.
      drm: Unify radeon offset checking.
      i915_vblank_tasklet: Try harder to avoid tearing.
      DRM: handle pci_enable_device failure
      drm: fix return value check


I didn't get correct bisecting. Seems git-bisect can't correctly working with
2.9.19 tree or i did some thin really wrong, so i get this resoult:

commit e1036502e5263851259d147771226161e5ccc85a
Author: Nicolas Pitre <nico at cam.org>
Date:   Tue Dec 12 13:32:29 2006 -0500

    [PATCH] remove config ordering/dependency between ucb1400-ts and sound
subsy

    Commit 2d4ba4a3b9aef95d328d74a17ae84f8d658059e2 introduced a dependency
    that was never meant to exist when the ac97_bus.c module was created.
    Move ac97_bus.c up the directory hierarchy to make sure it is built when
    selected even if sound is configured out so things work as originally
    intended.

    Signed-off-by: Nicolas Pitre <nico at cam.org>
    Acked-by: Randy Dunlap <randy.dunlap at oracle.com>
    Signed-off-by: Linus Torvalds <torvalds at osdl.org>


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