lkml.org 
[lkml]   [2007]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [patch] CFS scheduler, -v12
    On Sun, May 13, 2007 at 05:38:53PM +0200, Ingo Molnar wrote:
    >> So i've added a yield workaround to -v12, which makes it work similar to
    >> how the vanilla scheduler and SD does it. (Xorg has been notified and
    >> this bug should be fixed there too. This took some time to debug because
    >> the 3D driver i'm using for testing does not use sys_sched_yield().) The
    >> workaround is activated by default so -v12 should work 'out of the box'.

    On Thu, May 17, 2007 at 05:18:41PM -0700, Bill Huey wrote:
    > This is an incorrect analysis. OpenGL has the ability to "yield" after
    > every frame specifically for SGI IRIX (React/Pro) frame scheduler (driven
    > by the system vertical retrace interrupt) so that it can free up CPU
    > resources for other tasks to run. The problem here is that the yield
    > behavior is treated generally instead of specifically to a particular
    > proportion scheduler policy.
    > The correct solution is for the app to use a directed yield and a policy
    > that can directly support it so that OpenGL can guaratee a frame rate
    > governed by CPU bandwidth allocated by the scheduler.
    > Will is working on such a mechanism now.

    What? AFAIK the CFS patches already implement directed yields.


    -- wli
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-18 06:15    [W:4.390 / U:0.056 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site