Re: [announce] CFS-devel, performance improvements

Mike Galbraith
2007-09-12T06:20:33Z

On Tue, 2007-09-11 at 22:04 +0200, Ingo Molnar wrote:
> fresh back from the Kernel Summit, Peter Zijlstra and me are pleased to
> announce the latest iteration of the CFS scheduler development tree. Our
> main focus has been on simplifications and performance - and as part of
> that we've also picked up some ideas from Roman Zippel's 'Really Fair
> Scheduler' patch as well and integrated them into CFS. We'd like to ask
> people go give these patches a good workout, especially with an eye on
> any interactivity regressions.

Initial test-drive looks good here, but I do see a regression. First
the good news.

fairtest2 is perfect, more perfect than ever seen before in fact. Mixed
interval sleepers/hog looks fine as well (can't say perfect due to
startup differences with the various proggies, but cpu% looks perfect).
Amarok song switch time under hefty kbuild load is fine as well. I
haven't done heavy multimedia testing yet, but will give it a more
thorough workout later (errands).

The regression: I see some GUI lurch, easily reproducible by running a
make -j5 and moving the mouse in a circle... perceptible (100ms or so)
lurches not present in rc5.

-Mike