On Thu, Apr 19, 2007 at 07:40:04PM +1000, Con Kolivas wrote: > On Thursday 19 April 2007 13:22, Nick Piggin wrote: > > On Thu, Apr 19, 2007 at 12:12:14PM +1000, Con Kolivas wrote: > > > Version 0.42 > > > > > > http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc7-sd-0.42.patch > > > > OK, I run some tests later today... > > > Thank you very much.
lmbench numbers are roughly comparable to mainline (lmbench seems to be a bit erratic, but there isn't the obvious drop that cfs has). Didn't worry about hackbench ;) kbuild: 2.6.21-rc7 508.87user 32.47system 2:17.82elapsed 392%CPU 509.05user 32.25system 2:17.84elapsed 392%CPU 508.75user 32.26system 2:17.83elapsed 392%CPU 508.63user 32.17system 2:17.88elapsed 392%CPU 509.01user 32.26system 2:17.90elapsed 392%CPU 509.08user 32.20system 2:17.95elapsed 392%CPU 2.6.21-rc7-sd42 512.78user 31.99system 2:18.41elapsed 393%CPU 512.55user 31.90system 2:18.57elapsed 392%CPU 513.05user 31.78system 2:18.48elapsed 393%CPU 512.46user 32.06system 2:18.63elapsed 392%CPU 512.78user 31.81system 2:18.49elapsed 393%CPU 512.41user 32.08system 2:18.70elapsed 392%CPU sd42 is doing about 745 context switches per second here, and perfomance is slightly below mainline. But it isn't doing badly. 507.87user 32.53system 2:17.50elapsed 392%CPU 508.47user 32.40system 2:17.56elapsed 393%CPU 508.59user 32.27system 2:17.53elapsed 393%CPU A few runs with rr_interval at 100 show that ctxsw numbers drop to 587, and performance is up to slightly above mainline. With the results I've got so far with all scedulers (actually I didn't try nicksched with a small timeslice, but I'm sure it would give the expected result)... I'd say 5ms might be too small a timeslice. Even 15ms will hurt some people I think. Although we could arguably tolerate this kind of regression, my box only has 1MB caches, and kbuild is naturally context switching at over 500 per second anyway. On something with bigger caches and less context switchy / more cache sensitive workloads, the regression could be quite a bit worse. (not directed at anyone in particular, but food for thought) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
