On Tue, Apr 17, 2007 at 08:56:27AM +0100, Andy Whitcroft wrote: > > > > as usual, any sort of feedback, bugreports, fixes and suggestions are > > more than welcome, > > Pushed this through the test.kernel.org and nothing new blew up. > Notably the kernbench figures are within expectations even on the bigger > numa systems, commonly badly affected by balancing problems in the > schedular. > > I see there is a second one out, I'll push that one through too.
Well I just sent some feedback on cfs-v2, but realised it went off-list, so I'll resend here because others may find it interesting too. Sorry about jamming it in here, but it is relevant to performance... Anyway, roughly in the context of good cfs-v2 interactivity, I wrote: Well I'm not too surprised. I am disappointed that it uses such small timeslices (or whatever they are called) as the default. Using small timeslices is actually a pretty easy way to ensure everything stays smooth even under load, but is bad for efficiency. Sure you can say you'll have desktop and server tunings, but... With nicksched I'm testing a default timeslice of *300ms* even on the desktop, wheras Ingo's seems to be effectively 3ms :P So if you compare default tunings, it isn't exactly fair! Kbuild times on a 2x Xeon: 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-cfs-v2 534.80user 30.92system 2:23.64elapsed 393%CPU 534.75user 31.01system 2:23.70elapsed 393%CPU 534.66user 31.07system 2:23.76elapsed 393%CPU 534.56user 30.91system 2:23.76elapsed 393%CPU 534.66user 31.07system 2:23.67elapsed 393%CPU 535.43user 30.62system 2:23.72elapsed 393%CPU 2.6.21-rc7-nicksched 505.60user 32.31system 2:17.91elapsed 390%CPU 506.55user 32.42system 2:17.66elapsed 391%CPU 506.41user 32.30system 2:17.85elapsed 390%CPU 506.48user 32.36system 2:17.77elapsed 391%CPU 506.10user 32.40system 2:17.81elapsed 390%CPU 506.69user 32.16system 2:17.78elapsed 391%CPU - 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/