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    SubjectRe: CFS review
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    On Wed, 2007-08-29 at 06:18 +0200, Ingo Molnar wrote:

    > > Then lay them out side by side to see the periodic stallings for
    > > ~10sec.

    The X scheduling code isn't really designed to handle software GL well;
    the requests can be very expensive to execute, and yet are specified as
    atomic operations (sigh).

    > i just tried something similar (by adding Option "NoDRI" to xorg.conf)
    > and i'm wondering how it can be smooth on vesa-driver at all. I tested
    > it on a Core2Duo box and software rendering manages to do about 3 frames
    > per second. (although glxgears itself thinks it does ~600 fps) If i
    > start 3 glxgears then they do ~1 frame per second each. This is on
    > Fedora 7 with xorg-x11-server-Xorg-1.3.0.0-9.fc7 and
    > xorg-x11-drv-i810-2.0.0-4.fc7.

    Are you attempting to measure the visible updates by eye? Or are you
    using some other metric?

    In any case, attempting to measure anything using glxgears is a bad
    idea; it's not representative of *any* real applications. And then using
    software GL on top of that...

    What was the question again?

    --
    keith.packard@intel.com
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