System Administration

High GBL_CPU_INTERRUPT_UTIL on HPUX 11.00 (D220)

 
R.M.PANDIAN
Occasional Advisor

High GBL_CPU_INTERRUPT_UTIL on HPUX 11.00 (D220)

Hi,

We are using two identically configured systems (Both are D220, 640MB, 1 disk mirrored), running HPUX10.20 on one host and HPUX 11.00 on the other. So, both are running 32 bit O/S. (D220 does not support 64bit HPUX)

As part of our Stress Testing, we are using the same application code and measure the performance using Measureware on both the host.

Overall CPU utilization has gone high by 5 to 6% in HPUX 11.00.

When we drill down, the GBL_CPU_INTERRUPT_UTIL is 2.5 %(average) on UX 10.20 and 6.5 % in 11.00.

There is no memory pressure on the system. Disk utilization is 12% on HPUX 10.20, 10% on HPUX 11.00.

What can I now look to see what the CPU is doing in the 6.5% of its time (interrupt_util).
Why it is 4% more in HPUX 11.00.

On Idle condition, they use about 1 to 1.5% Total_CPU_UTIL each. Hence the high CPU_INTERRUPT_UTIL is experienced only when the system is loaded.

What kind of operations are included in the INTERRUPT_UTIL ?

Any Kernel guru there?

Thanks
Pandian.
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