Steve Roome wrote:
We're using mostly:
5.4-STABLE FreeBSD 5.4-STABLE #0: Mon Jun 6 12:22:18 BST 2005
This is on a Dell PowerEdge 2850. (2 * 2.8 GHz Xeons, 4GB ram, disks),
we've been keeping up with stable because supposedly all these new
fixes to threading will help us out here.
We're trying to get FreeBSD to perform reasonably well, in comparison
to Linux, or even what we should expect to see. We're getting about
half the performance we get from gentoo on the same application
(mysql).
The discussion on the 'freebsd-threads' mailing list about a year ago
seems to match our experiences nowadays pretty well:
http://lists.freebsd.org/pipermail/freebsd-threads/2004-May/002002.html
Nothing much seems to have changed, although lots of people claim that
FreeBSD 5.x is now fine, it doesn't seem to be.
Here's a rough breakdown of the sort of performance we're seeing, this
is the default select-key super-smack but setup for innodb rather than
myisam.
Using the simple 'select-key.smack' Super-Smack benchmark (50 clients
with 1000 runs each):
OS CPUs Build Threading Kqueries/sec
-------------------------------------------------------------
FreeBSD 1 Pro KSE 10.6
FreeBSD 1 Pro libthr 10.6
FreeBSD 2 Pro libthr 14.4
FreeBSD 2 Source libthr 14.5
FreeBSD 2 Source KSE/P (static) 15.7
FreeBSD 2 Source KSE/P (dynamic) 15.8
FreeBSD 2 Source KSE/S (dynamic) 15.8
FreeBSD 2 Pro KSE 15.9
FreeBSD 2 Source LinuxThreads 17.7
Gentoo 2 Source NPTL 34.0 !!
(KSE/P = KSE with Process Scope Threading, KSE/S = KSE with System
Scope Threading)
Quick ideas:
Have you tried a kernel with PREEMPTION enabled? I haven't quantified
the effect, but it's improved performance in some situations.
Have you tried increasing vfs.read_max?
Guy
--
Guy Helmer, Ph.D., Principal System Architect, Palisade Systems, Inc.
[EMAIL PROTECTED]
http://www.palisadesys.com/~ghelmer
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