On Nov 18, 2006, at 7:52 AM, O. Hartmann wrote:
Marcelo Gardini do Amaral wrote:
FYI: In response to feedback from ISC, there are UDP transmit
optimizations
in FreeBSD 7.x. These have a relatively minor performance impact
for
single-threaded applications, but in the special case of BIND
accessing a
single UDP socket from many different threads, it significantly
improves
performance. I'll look at MFC'ing these to 6.x after 6.2-RELEASE
(especially if reminded in a month or so :-).
With regard to the possible bge issue -- I would encourage you to
test
using a 7.x kernel, ideally with all the debugging disabled, and
see if
there's been any improvement (or regression). There has been a
lot of
change in these areas, and it would be helpful to know what, if
any, impact
this has had.
I made some tests using 7.x with all the debugging disabled:
queries / s
Int bind (d_t) bind (e_t) nsd (1_s) nsd (2_s)
--- ---------- ---------- --------- ---------
bge 15439 14733 12910 10946
em 37655 34092 42411 41974
d_t: disable threads
e_t: enable threads (libpthread)
1_s: 1 server forked
2_s: 2 server forked
Bind: 9.2.3
NSD: 3.0.2
em: Dell 1950, Intel NIC, SMP kernel
bge: HP Blade BL35p, Broadcom NIC, SMP kernel
Client: Dell 1750, Intel NIC, FreeBSD 4.11 UP, running queryperf
The results are very good for em NIC, better than my numbers [1] with
FreeBSD 6.1 some months ago. So I guess that we had an
improvement :-)
But I got the same poor performance with the bge interface. The
problem remains.
[1] http://lists.freebsd.org/pipermail/freebsd-net/2006-September/
011767.html
Cheers,
Marcelo
These results looks very puzzling to me.
As far as I know, multithreading and/or multiprocessors should perform
better anyway than a single threaded application within other
applications on an UP box. Strange results ...And more strange than
this
is the result taken from the FBSD 4.11 box! Is there an explanation
why
FreeBSD performs so bad beyond 4.X and on SMP boxes? Please show me
threads ...
Thanks and regards,
Oliver
The FreeBSD pthread library and BIND don't work well together. If
you use the libthr library, performance goes up.
--
Dave
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