Fine-grained locking for POSIX local sockets (UNIX domain sockets)

[Kris Kennaway]

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.

Kris
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-performance/attachments/20060509/e004cd33/attachment.pgp