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.
-Maxim
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