[Bug 23085] New: Radeon KMS: XGetImage very slow, as is Firefox scrolling

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23085

           Summary: Radeon KMS: XGetImage very slow, as is Firefox scrolling
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: jafeiner at gmail.com
         QAContact: xorg-team at lists.x.org


I finally managed to get KMS working on my Gentoo laptop.  I have a Radeon
Mobility X300 in a ThinkPad T43.  I am using the latest Git of the entirety of
the X11 stack (drivers, libs, proto, server, etc.) as of late morning August 1.
 I am also using Linus's kernel tree for 2.6.31 to get the DRM driver for KMS.

Running x11perf -getimage500 results in about 7 per second and -getimage100 is
about 100 something.  Using non-KMS (older build of X11 by a few weeks, but
still from Git) results in -getimage500 producing around 115 per second and
-getimage100 around 9500 per second.  I have a feeling this may be responsible
for the slow scrolling in Firefox and other apps.  CPU time is almost all in
user-space according to my CPU monitor and oprofile, when it decides to work,
confirms this.  Seems to me that this would indicate a software fallback of
some sort?  I'm not sure how to diagnose it beyond that since oprofile
continues to fail in even more miraculous ways for me.

I am using all defaults for radeon driver options in my xorg.conf (yes, I'm
still using one :/).


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