Date: Thu, 19 Jul 2007 01:56:53 -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: <20070719015335.Q561@10.0.0.1> In-Reply-To: <20070719121201.P67760@woozle.rinet.ru> References: <20070716233030.D92541@10.0.0.1> <20070718011332.A14574@woozle.rinet.ru> <20070718154306.R561@10.0.0.1> <20070719121201.P67760@woozle.rinet.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 19 Jul 2007, Dmitry Morozovsky wrote: > On Wed, 18 Jul 2007, Jeff Roberson wrote: > > JR> > Works for me with MSI S420 lapton (core2duo T2400) on fresh -CURRENT/i386 > JR> > CPU: Genuine Intel(R) CPU T2400 @ 1.83GHz (1833.41-MHz > JR> > 686-class CPU) > JR> > > JR> > However, make -j3 buildworld buildkernel (trimmed GENERIC) time degraded > JR> > by 7%: > JR> > > JR> > +------------------------------------------------------------------------------+ > JR> > N Min Max Median Avg Stddev > JR> > x 5 36.33 36.77 36.45 36.486 > JR> > + 5 38.87 39.23 39.03 39.042 > JR> > Difference at 95.0% confidence > JR> > 2.556 +/- 0.216322 > JR> > 7.00543% +/- 0.59289% > JR> > (Student's t, pooled s = 0.148324) > JR> > > JR> > before = kernel with SCHED_4BSD, after = SCHED_ULE with your patchset. > JR> > Both > JR> > are without WITNESS/INVARIANTS. > JR> > JR> Hi Dmitry, > JR> > JR> Can you test with http://people.freebsd.org/~jeff/sched_ule.c? I believe > JR> this will somewhat improve the situation with buildkernel. I have tested > JR> with my own core2duo laptop. The first run after reboot is now about 7% > JR> faster than before. Subsequent runs are not improved as much. Only 2-3%. > JR> You can also try tuning sysctl kern.sched.steal_thresh down as low as 1 to > JR> see how much this may help. Unfortunately lower values tend to really hurt > JR> other tests. > > > Well, I'm a bit puzzled: with new sched_ule.c system+user time slightly > decreases (within one minute), while real time goes up from 39 to 44 minutes! > And most of the time I see 10-50% of idle in top. Please try setting sysctl kern.sched.steal_thresh=2 This is the setting I intend to commit. I also was only testing buildkernel which tends to run more processes concurrently as compared to buildworld. Thanks, Jeff > > Any hints? > > 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" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070719015335.Q561>