- wrote the following on 11/20/2013 10:46 AM:
Daniel, what do you see the load as? I see 4.6% CPU usage (100% possible
- 95.4% idle).
Wondering the same. Don't consider 0.00 high load. ;-)
:-) I guess I need to be a little better at explaining my self. It
made perfect sense to me.
I am talking about the named process which can run up to 180% during
the day. When it is doing this the system still has very low load.
I'm not sure which versions of BIND you were using on RHEL5, but the
newer versions do tend to use more CPU usage (I'll assume due to new
features, patches, etc in the BIND code).
--Blake
- wrote the following on 11/20/2013 9:37 AM:
We recently upgraded one of our DNS servers to RHEL 6. The other two
servers are running RHEL 5. The new system is showing much higher CPU
load than the other two (RHEL 5 machines sit around 11-15%). I am not
sure if this is related to the OS versions
or something else. The build procedure for the new system is completely
different than before which could also be the cause. Any ideas why this
could be happening?
Were the configure options the same when you built on 5.x vs 6.x? You can
see that with named -V.
You mention a different build procedure -- do you mean named or OS? As a
first step I would focus on those differences. FWIW I have moved about 30
recursive resolvers with the highest iterative workload I've had the
privilege of managing to centos 6.x and had no ill effects so I don't
think it's simply the OS itself.
Again, it made perfect sense to me.
I am talking about the OS builds. Bind is compiled with the exact same
options and the configs for this system is identical to the other
slave server.
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.
The issue for me is the HIGH CPU use for named. It is much lower for
our RHEL 5 systems.
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.
--Blake
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