RHEL 6 CPU load

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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?

> top
last pid:  9651;  load avg:  0.00,  0.00,  0.00;  up
2+01:08:04                                      08:31:10
647 processes: 1 running, 646 sleeping
CPU states:  1.4% user,  0.0% nice,  3.2% system, 95.4% idle,  0.0% iowait
Kernel: 137575 ctxsw, 7682 intr
Memory: 2023M used, 21G free, 318M buffers, 747M cached
Swap: 26G free

  PID USERNAME  THR PRI NICE  SIZE   RES   SHR STATE   TIME    CPU COMMAND
 8566 root       27  20    0 1921M  296M 2848K sleep  26:56   132% named

> rndc status
version: 9.9.4-P1 () <id:07aaf1ef>
CPUs found: 24
worker threads: 24
UDP listeners per interface: 24
number of zones: 169
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is ON
recursive clients: 22/9900/10000
tcp clients: 0/100
server is up and running

--
Daniel
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