http://bugs.freedesktop.org/show_bug.cgi?id=26816

           Summary: AGP KMS x11 video perf problem.
           Product: DRI
           Version: XOrg CVS
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: li...@andyfurniss.entadsl.com


RV670 AGP running git ddx, xserver, libdrm and drt + nopat/AGP ttm caching fix
patch. Problem is not new.

I think there is a caching problem with KMS that does not happen with UMS which
makes video that doesn't use xv like flash or mplayer -vo x11 eat too much Cpu.

A partial work around can be achieved by disabling accel UTS, but it's still
not as good as UMS.

Some top figures - this is with mplayer -vo x11 704x...@25fps Cpu is single
core 2.1GHz.

UMS

Cpu(s): 18.7%us,  2.3%sy,  0.0%ni, 79.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
2504 andy      40   0 39008  13m 7748 S 13.3  1.5   0:01.10 mplayer
2472 root      40   0  591m 8508 5872 S  7.3  0.9   0:02.51 Xorg

KMS + ExaNoUploadToScreen

Cpu(s): 36.3%us,  0.3%sy,  0.0%ni, 63.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
4955 root      40   0 21140 9052 5760 S 22.9  1.0   0:04.76 Xorg
5006 andy      40   0 37980  13m 7836 S 13.6  1.5   0:00.71 mplayer

KMS

Cpu(s): 17.9%us, 60.8%sy,  0.0%ni, 21.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
4897 root      40   0 19628 8684 6040 R 65.8  1.0   0:29.11 Xorg
4925 andy      40   0 37980  13m 7836 S 13.0  1.5   0:00.91 mplayer

Will try and get a useful sysprof current effort just says in kernel for the
last case.


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