On Thu, Jan 27, 2011 at 01:32:25PM -0800, Tom Herbert wrote:

Yes, we are still planning this.  The UDP implementation for my
earlier patch should be usable to try for DNS/UDP-- this is in fact
where we saw a major performance gain.  Eric Dumazet had some nice
improvements that should probably be looked at also.

I can confirm this.

Serious scalability issues have been reported on a 12 core system
running bind 9.7-2. The system was only able to deliver ~110K queries
per second.

Using your SO_REUSEPORT patch and a modified bind using it. The same
system is able to deliver ~650K queries per seconds while maxing out
all cores completely.

Tom, Bill: do you have a timeline for merging this? Especially the
UDP bits?

-Thomas