Conference turris::digital_unix

9719.0. "How to disable CPU ?" by BRADEC::PODOLINSKY (Peter Podolinsky - MCS Slovakia) Mon May 05 1997 17:45

Hi all,
I am trying to find a work-arround for the following situation:
Dual CPU AS8400, DUNIX V3.2G and !!!ATM adapter!!!
Of course, UNIX (ATM) complains about not supporting ATM on multiprocessor systems. This is a known fact,
it is an unsupported configuration.

However, we need to configure ATM even by "loosing" one CPU. Is there any way for a dual CPU AS8400
to behave as a single CPU machine ?

I have tried to modify the console parameter "cpu_enabled" to various values, but no luck. UNIX still
sees two CPUs. Stopping secondary CPU on a running system (psradm) is not enough, ATM is still aware
it is a dual CPU system.
Any idea how to get ATM working on a dual CPU sytem with V3.2G ?

Regards,
	Peter

    re .0
    Yes setting 'cpu_enabled' at console level is what you want. Now I hope
    I remember correctly: cpu_enabled is a bitmap with each bit switching a
    cpu on/off. So if you just want cpu 0 you should set cpu_enabled to 1.
    AND you need to reset the hardware to let the cpu_enabled bitmap have
    the desired effect. Turn the key at the 8400 to 'reset'.
    
    	Martin

    see MVBLAB::SABLE note 1835.0 and (for Turbolaser) 1835.1
    
    see also:
    	note 9355.* in this conference
    	note 3827.* in this conference
    	note 2658.* in this conference
    	TURRIS::FORTRAN note 281.*

    Thanks,
    applied info from SABLE conf. note 1835.1, worked fine.
    
    Peter