Messages in this thread | | | Date | Thu, 17 May 2007 21:13:09 -0700 | From | William Lee Irwin III <> | Subject | Re: [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/
| |