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Re: How disable one of dual processors?

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



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

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:
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


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