Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

William Lee Irwin III
2007-05-23T04:12:07Z

On Wednesday 23 May 2007 10:28, Bill Davidsen wrote:
>>> kernel 2.6.21-cfs-v13 2.6.21-ck2
>>> a) 194464 254669
>>> b) 54159 124
>> Everyone seems to like ck2, this makes it look as if the video display
>> would be really pretty unusable. While sd-0.48 does show an occasional
>> video glitch when watching video under heavy load, it's annoying rather
>> than unusable.

On Thu, May 24, 2007 at 10:36:44AM +1000, Con Kolivas wrote:
> That's because the whole premise of your benchmark relies on a workload that
> yield()s itself to the eyeballs on most graphic card combinations when using
> glxgears. Your test remains a test of sched_yield in the presence of your
> workloads rather than anything else. If people like ck2 it's because in the
> real world with real workloads it is better, rather than on a yield() based
> benchmark. Repeatedly the reports are that 3d apps and games in normal usage
> under -ck are better than mainline and cfs.

Maybe people should explicitly hack on sched_yield() for these things
and do comparative benchmarking of sched_yield() implementations.

-- wli