Date: Wed, 18 Jul 2007 15:46:54 -0700 (PDT) From: Jeff Roberson <jroberson@chesapeake.net> To: Dmitry Morozovsky <marck@rinet.ru> Cc: current@freebsd.org Subject: Re: ULE/SCHED_SMP diff for 7.0 Message-ID: <20070718154306.R561@10.0.0.1> In-Reply-To: <20070718011332.A14574@woozle.rinet.ru> References: <20070716233030.D92541@10.0.0.1> <20070718011332.A14574@woozle.rinet.ru>
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On Wed, 18 Jul 2007, Dmitry Morozovsky wrote: > On Mon, 16 Jul 2007, Jeff Roberson wrote: > > JR> http://people.freebsd.org/~jeff/ule.diff > JR> > JR> This patch is scheduled for inclusion in 7.0. I would like anyone who cares > JR> to run it to validate that it does not create any stability or performance > JR> regression over the existing ULE. This patch replaces ULE with SCHED_SMP, > JR> which will now no longer exist as a seperate fork of ULE. > JR> > JR> Briefly, this is still a very suitable scheduler for uniprocessor machines > JR> while providing stronger affinity and other performance improvements for > JR> multiprocessor machines. > JR> > JR> Even "works for me!" type responses are welcome so I know roughly how many > JR> people have tested before I commit this close to release. > > Works for me with MSI S420 lapton (core2duo T2400) on fresh -CURRENT/i386 > CPU: Genuine Intel(R) CPU T2400 @ 1.83GHz (1833.41-MHz 686-class CPU) > > However, make -j3 buildworld buildkernel (trimmed GENERIC) time degraded by 7%: > > marck@mck-s420:/var/tmp> ministat before after > x before > + after > +------------------------------------------------------------------------------+ > | x + | > | x + | > |x x x + + +| > ||__MA____| |__A__| | > +------------------------------------------------------------------------------+ > N Min Max Median Avg Stddev > x 5 36.33 36.77 36.45 36.486 0.16637307 > + 5 38.87 39.23 39.03 39.042 0.12774976 > Difference at 95.0% confidence > 2.556 +/- 0.216322 > 7.00543% +/- 0.59289% > (Student's t, pooled s = 0.148324) > > before = kernel with SCHED_4BSD, after = SCHED_ULE with your patchset. Both > are without WITNESS/INVARIANTS. Hi Dmitry, Can you test with http://people.freebsd.org/~jeff/sched_ule.c? I believe this will somewhat improve the situation with buildkernel. I have tested with my own core2duo laptop. The first run after reboot is now about 7% faster than before. Subsequent runs are not improved as much. Only 2-3%. You can also try tuning sysctl kern.sched.steal_thresh down as low as 1 to see how much this may help. Unfortunately lower values tend to really hurt other tests. Thanks, Jeff > > Sincerely, > D.Marck [DM5020, MCK-RIPE, DM3-RIPN] > ------------------------------------------------------------------------ > *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** > ------------------------------------------------------------------------ > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >
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