Date: Mon, 06 Aug 2007 17:00:47 +0300 From: Niki Denev <nike_d@cytexbg.com> To: Ivan Voras <ivoras@geri.cc.fer.hr> Cc: freebsd-arch@freebsd.org Subject: Re: On schedulers Message-ID: <46B7298F.2030804@cytexbg.com> In-Reply-To: <20070805204321.H43187@geri.cc.fer.hr> References: <f8o49l$sd1$1@sea.gmane.org> <46B1C69D.6070503@cytexbg.com> <20070802181239.O561@10.0.0.1> <20070803034628.U561@10.0.0.1> <20070805204321.H43187@geri.cc.fer.hr>
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Ivan Voras wrote: > On Fri, 3 Aug 2007, Jeff Roberson wrote: > >> On Thu, 2 Aug 2007, Jeff Roberson wrote: >> >>> On Thu, 2 Aug 2007, Niki Denev wrote: >>> >>>> Both idle and glxgears are run as normal user. >>> >>> Can you tell me what % cpu is going to each process during this >>> time? These results are surprising. For workloads like this ULE >>> should essentially implement a 'fair' scheduling policy. However, >>> so should 4BSD. So I'm not yet sure why the slowdown wouldn't be >>> relative to the number of running threads. Also, 'vmstat 1' output >>> would be useful. > > I'm glad this discussion is happening, but: > > - I wasn't really interested in 3D performance, but mostly in if > there's theoretical modelling of how ULE should perform, and/or its > comparison to Linux (e.g. elaboration of what 'fair' means for ULE). > - People who know (meaning those who work with or develop X11) say > that glxgears is awful for testing graphical performance. I don't know > exactly why is that, but I've seen widely varying results from > glxgears on related mailing lists that seem to confirm this. From > personal experience I've seen glxgears "topping out" with much idle > CPU left, both extremely high and extremely low results from it on > hardware that shouldn't behave like that, so I agree with this. Quake > should be much better for benchmarking :) > > Sorry for my late reply, i was out of town for the weekend. It seems that glxgears really does not give meaningfull results, because after reruning the same tests several times i got very different results. I will try to run the same test again, but with quake this week if time permits. I'm thinking about testing it with and without 3d acceleration. Best Regards, Nikihome | help
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