disable CPU using icod

[skt_skt]

i wanted to disable a CPU which is online and currently serving the imterrupts.So that all future interrupts would be served by another CPU. I have added the CPU online (icapmodify -a 8). But never dsisabled online.So that all future interrupts would be served by another CPU.

is that possible online? what tool we need for that?

HP-UX 11.11
PA RISC

is there separate tool if 11.23?

[Duncan Edmonstone]

Santhosh,

I'm not sure why you are worrying about interrupts - iCAP will take care of all that behind the scenes - removing those CPUs is done exactly the same as adding them:

icapmodify -d 8

would remove 8 CPUs from the partition the command was run in.

If you really want to look at what's happening with interrupts then install this software on 11.11:

http://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=INTRMIGR

This provides you with the intctl command which allows you to move CPU interrupts around. In some extreme situations if you are really trying to squeeeze every ounce of performance out of a system, moving an interrupt to a CPU which is cell-local to the IO card the interrupt is serving might offer some advantage, but I really wouldn't sweat this stuff unless your're into serious benchmarking.

If I recall correctly, intctl is part of the OS on 11.23 and 11.31.

HTH

Duncan

[skt_skt]

is that possible to disable a single/specic CPU?

[Tim Nelson]

As a last resort you can always disable specific CPUs using MP commands.

But this requires an outage.

[Court Campbell]

yes, icapmodify -d 1.