Messages in this thread | | | Date | Mon, 15 Jun 2009 23:23:18 -0700 | From | Andrew Morton <> | Subject | Re: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support. |
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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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