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SubjectRe: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support.
On Tue, 16 Jun 2009 11:08:39 +0530 Gautham R Shenoy <ego@in.ibm.com> wrote:

> Currently on a ppc64 box with 16 CPUs, the time taken for
> a individual cpu-hotplug operation is as follows.
>
> # time echo 0 > /sys/devices/system/cpu/cpu2/online
> real 0m0.025s
> user 0m0.000s
> sys 0m0.002s
>
> # time echo 1 > /sys/devices/system/cpu/cpu2/online
> real 0m0.021s
> user 0m0.000s
> sys 0m0.000s

Surprised. Do people really online and offline CPUs frequently enough
for this to be a problem?



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