Re: How disable one of dual processors?

[Dean Hamstead <dean@bong.com.au>]

given that cpu0 is dead, you might get some life out of it
in the interum before getting a replacement by simply
physically swapping cpus

(2c)

Dean

Benjamin Herrenschmidt wrote:
> On Wed, 2005-06-01 at 16:04 -0300, Paulo Ricardo Paz Vital wrote:
>
> > Hello fellows,
> >
> > I have a dual PowerMac G4 (described below in /proc/cpuinfo) and for a
> > few months it has presenting some problems. When I am operating the
> > machine, is presented in gkrellm that the processor #1 stops
> > operating. This crash presents two different scenes: (1) the processor
> > #1 stops but the processor #0  operates normally, supporting all
> > amount of work; and (2) the two processors stops and I need reboot the
> > machine.
> >
> > I'm using the kernel version 2.6.8 and this same problem occur in
> > other kernel versions and in Mac OS X, too.
> >
> > Verifying /var/log/messages, I can see this anormal message: 
> >
> > ------------------------------------------------------------------------------------
> > /var/log/messages:
> > May 30 11:20:23 falcao kernel: Machine check in kernel mode.
> > May 30 11:20:23 falcao kernel: Caused by (from SRR1=20009030): L1 Data
> > Cache error
> > ------------------------------------------------------------------------------------
> >
> > I did some searches using Google, but I didn't find a solution for
> > this problem. I suppose disabling the processor #1, I can solve this
> > problem. So, how can I disable one of my dual processors?? Or, how can
> > I solve this problem :-D ??
>
>
> Looks like one of your processors is indeed broken. Try booting with
> maxcpus=1 on the kernel command line (and hope that's not CPU0 that is
> dead).
>
> Ben.