Date: Mon, 16 Apr 2007 13:46:26 +0200 From: Gary Jennejohn <garyj@jennejohn.org> To: freebsd-current@freebsd.org Subject: Re: Some comments on ZFS Message-ID: <200704161146.l3GBkQQi047570@peedub.jennejohn.org>
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I wrote: > With the old setup I saw: > a) ``make -j2 buildworld'' usually pegged the CPU at 97%. > [snip] > With the new setup: > a) ``make -j2 buildworld'' only reaches about 70% CPU load. Is ZFS stealing > so much CPU? > This turned out to be a problem with SCHED_ULE. I was seeing cpu0 80% idle almost all the time. After switching to SCHED_4BSD I see both CPUs used to within about 5% of each other. SCHED_4BSD tends to use cpu1 more than cpu0. SCED_ULE exhibited the same behavior, but more dramatically. -- Gary Jennejohn / garyjATjennejohnDOTorg gjATfreebsdDOTorg garyjATdenxDOTde
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