Re: DNS Performance Numbers

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

--
Att.,

Marcelo Gardini
NIC .br

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