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? -MaximReceived on Mon May 08 2006 - 23:18:32 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:55 UTC