On 12/11/2007, Feng Xian <feng.xian@xxxxxxxxx> wrote:
> Hi,
>
> I am doing a scalable test on a 16-core machine (8 dual-core amd
> processors). So I need to vary the processors from 1 to 16. But I
> couldnt remove the cores from motherboard. Is there any way to achieve
> this by changing the max number of processors in the kernel? Thanks!
>From Documentation/kernel-parameters.txt in a linux source tree:
maxcpus= [SMP] Maximum number of processors that an SMP kernel
should make use of. maxcpus=n : n >= 0 limits the
kernel to using 'n' processors. n=0 is a special case,
it is equivalent to "nosmp", which also disables
the IO APIC.
Just add that parameter on your grub config or directly on the grub shell.
Rui
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