[Bug 34156] New: r600g performance regression between 780c183b and 862ebb41

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34156

           Summary: r600g performance regression between 780c183b and
                    862ebb41
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: dawitbro@sbcglobal.net


Performance suddenly improved by 50-150% across the board in late January, so
I've been very happy with Mesa r600g lately!  I've been trying to do quick
builds for testing every couple of days when I get home from work, watching out
for any changes in performance.

My last build was at commit 780c183b (Feb. 6), and that was working great.

Tonight's build was at commit 862ebb41, and performance was degraded severely. 
For example, the previous build allowed torcs to hit fps in mid 30's,
occasionally hitting up to 60 fps; tonight I'm getting mid 20's, occasionally
hitting 30 fps.  Other apps, and even the desktop, are noticeably more
sluggish.  (Reinstalling the previous packages restores excellent performance!)

I will try to bisect this, but some home improvement projects will prevent me
from attempting it until tomorrow night at the soonest, and more likely
Saturday morning.  Sorry for the delay.


Hardware:  Radeon HD 5750 (Evergreen JUNIPER)

Software:
  kernel 2.6.37 (+ radeon cherry-picks from drm-fixes)
  libdrm 2.4.23
  xorg-server 1.9.4
  xf86-video-ati 6.14.0

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