[Bug 57937] [SNB+] clflush before pageflip causes jitter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57937

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|chris at chris-wilson.co.uk    |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
            Summary|i915 SNA choppy graphics    |[SNB+] clflush before
                   |                            |pageflip causes jitter
            Product|xorg                        |DRI
            Version|7.7 (2011)                  |unspecified
          Component|Driver/intel                |DRM/Intel

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Try a more recent kernel. The issue is that you do not have a working
set-caching ioctl and you end up polluting the bo cache with uncached buffers,
which are comparatively slow and in the worst case cause render corruption.

'sudo perf top' should say that most of your cpu overhead is spent clflushing
buffers as they expire, or worse that the clflush occurs just before the
pageflip.

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