Kris Kennaway wrote: > On Mon, May 08, 2006 at 06:18:18PM -0700, Maxim Sobolev wrote: >> Kris Kennaway wrote: >>> On Mon, May 08, 2006 at 02:52:07AM -0400, Kris Kennaway wrote: >>>> OK, David's patch fixes the umtx thundering herd (and seems to give a >>>> 4-6% boost). I also fixed a thundering herd in FILEDESC_UNLOCK (which >>>> was also waking up 2-7 CPUs at once about 30% of the time) by doing >>>> s/wakeup/wakeup_one/. This did not seem to give a performance impact >>>> on this test though. >>> Turning down kern.hz from 1000 to 100 also made a big difference on 12 >>> CPUs (+6.1%). >>> >>> Note also that the system is no less than 40% idle during the runs (at >>> any load), so the bottlenecks are serious. >> Maybe HDD just can't keep up with the pace? > > There is no disk I/O involved. Oh, sorry. -MaximReceived on Mon May 08 2006 - 23:24:24 UTC
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