RHEL 6 CPU load

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> Depending on your OS and Bind settings, Bind may be performing IPv6/AAAA
> queries in parallel to IPv4/A queries. If IPv6 is disabled on your RHEL5
> server I suspect they may only be performing IPv4/A queries during
> recursion. You might check if this is, at least in part, responsible for the
> additional load.
>

I just compiled a version of bind on the RHEL 6 system with ipv6
disabled and the results were the same.

>
> You didn't provide the same CPU information about your RHEL 5 builds as you
> did for your RHEL6 system, so I just responded about the information you did
> provide. Are these 24/32 core systems? Do the same number of named child
> processes run on both the RHEL5 and RHEL6 systems? I'm going to assume that
> you've already examined query load on the servers and found them similar.

The other system only has 16 CPUs but named runs at a third of the CPU
that the RHEL 6 box does.

RHEL 5:
version: 9.9.4-P1 () <id:07aaf1ef>
CPUs found: 16
worker threads: 16
UDP listeners per interface: 16
number of zones: 169
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is ON
recursive clients: 30/9900/10000
tcp clients: 0/100
server is up and running

--
Daniel