On Mon, 5 Mar 2007, David Gilbert wrote:
"Dinesh" == Dinesh Nair <[EMAIL PROTECTED]> writes:
Dinesh> On Wed, 28 Feb 2007 01:06:33 -0800, Peter Losher
Dinesh> <[EMAIL PROTECTED]> wrote:
Ivan Voras wrote:
I agree in general, but MySQL performance is very exposed as an advocacy
issue - it has traditionally been the source of statements like
"FreeBSD's threading implementation is weak/bad/broken".
And these days ISC can't consciously recommend FreeBSD for use on
high-traffic DNS servers because UDP performance has (frankly) gone
downhill since 5.x. [..snipped..]
http://lists.freebsd.org/pipermail/freebsd-net/2006-September/011748.html
Dinesh> if UDP performance in 6.x and 7.x has dropped, this could even
Dinesh> affect voip applications/servers such as asterisk when run on
Dinesh> FreeBSD. most all use RTP for media traffic and RTP is nearly
Dinesh> always UDP generating up to 50 packets per second per call per
Dinesh> direction.
Dinesh> 14,000+ packets per second is only about 140 calls.
Well... again, BIND is not a good indicator of UDP performance. A
non-trivial application can send and receive about 250k pps on moderate
hardware.
One of the problems ISC diagnosed had to do with the highly unusual workload
pattern of UDP: many different threads simultaneously sending using a single
socket leading to unnecessary socket buffer contention. The previously posted
patches may help with this problem. So far I've not had any feedback on the
RELENG_6 patches, which I'm happy to commit once I've had reports of both good
stability and a performance improvement. This patch won't help more
traditional UDP workloads, in which aplications use different sockets to serve
different instances of the service, so access each socket from only one
thread.
Portions of the patch would also support future MFC's of other socket-related
performance optimizations and cleanups going on in FreeBSD 7.x, such as
Andre's recent work on optimized TCP send.
Robert N M Watson
Computer Laboratory
University of Cambridge
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