AIX

Dear Members ,

Curently we are migrating our AIX from 5.2.to 5.3, after migration when we check CPU through nmon it shows double in no i.e we have 8 CPU on our p570 box but nmom shows it 16 after investigation it was found that smtctl was enabled in AIX 5.3,can we disable the smtctl & what is the immpact of disabling it

Regards,

I don't suppose you want to disable smtctl (simultaneous multithreading mode) and i don't think it is responsible for the mismatch in the number of processors.

If you still want to disable it issue:

Code:

smtctl -m off -w now

as root.

Just a "dumb" question: you are not confusing logical with physical processors, are you?

I hope this helps.

bakunin

As Bakunin suggests, you might not want to disable it since smtctl is a plus for performance in most cases.
In case he is mixing Logical CPUs up (what I asume) a short explanation:
You see double amount of CPUs (logical CPUs) since SMT brings a second hardware thread up for multi processing, it will show 2 CPUs for 1 being built in with some tools like sar -P ALL 1 3 for example.
These 2 are Logical CPUs. Your number of real CPUs you can still grep with prtconf, lsconf or "lsdev -C| grep proc| grep -i available".