[Bug 36596] New: Major 2D performance bottleneck (most noticeable with compiz)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36596

           Summary: Major 2D performance bottleneck (most noticeable with
                    compiz)
           Product: Mesa
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: bluesloth600 at gmail.com


Created an attachment (id=46072)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=46072)
lspci -v

With compiz, making a new window or resizing a window makes the framerate drop
to 2 fps for about 5 or 6 seconds.

Running conky makes the frame rate that low most of the time, alternating with
brief moments of decent performance.  With a more traditional window manager
(openbox), a lot of programs (including xterm) freeze briefly every time conky
redraws itself, so it seems like that particular problem is not entirely a Mesa
bug.  Things run smoothly with the fbdev Xorg driver.

I tried compiz with the --no-fbo option once, and the framerate stayed at 2 fps
until I rebooted.  Restarting X didn't help, I actually had to reboot.

With the classic Mesa drivers, compiz would sometimes take a long time to
render a few frames, but not nearly as often as it does now.

I've had this problem with the Debian Mesa packages since they switched to
gallium, and with git master (as of yesterday) built with and without
--enable-gallium-llvm.

I run Debian sid on a Dell Inspiron 1721 with an integrated Radeon X1270.

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