DNS Performance Numbers

Robert Watson rwatson at FreeBSD.org
Sat Nov 11 09:22:32 UTC 2006


On Mon, 30 Oct 2006, Marcelo Gardini do Amaral wrote:

> Dave, could you please describe you test set?
>
> I've posted some results months ago and they were kind different.
>
> I have done some tests [1] [2] with bind and queryperf and my result on 
> FreeBSD 6.1 was very poor if compared with 4.11.
>
> Besides this, I have had bad results with NSD + 6.1 too and it doesn't use 
> threads. Because of that I realized that there is something strange with UDP 
> traffic on 6.1, as it was discussed in the threads below.

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.

Robert N M Watson
Computer Laboratory
University of Cambridge

  >
> [1]
> http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028247.html
>
> [2]
> http://lists.freebsd.org/pipermail/freebsd-net/2006-September/011767.html
>
>
> -- 
> Att.,
>
> Marcelo Gardini
>
>
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