Shawn Zhou wrote:
> Looks like BIND 9.9.4b1 has support for SO_REUSEPORT as test results I get
> from RHEL 6.5 look better than what I have from RHEL 6.4:
No, it doesn't. SO_REUSEPORT must be explicitly enabled on the
listening socket, and the string "SO_REUSEPORT" does not appear anywhere
in the BIND codebase. (I'm also fairly certain SO_REUSEPORT hasn't been
backported to RHEL 6's kernel, but I haven't checked that. In mainline
Linux, it is only present in versions >= 3.9.)
It would be relatively easy to add support for SO_REUSEPORT to BIND,
though. I recently added it to Unbound and the changes were fairly
simple:
http://thread.gmane.org/gmane.network.dns.unbound.user/2915
It resulted in decreased CPU utilization on Linux 3.9+, but I did not
measure the drop rate.
--
Robert Edmonds
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