Re: Fwd: Kernel Power management ?? turning off used devices thatare in use.

[Matthew Garrett]

On Fri, Nov 04, 2011 at 02:56:25PM +0800, hagar wrote:
> 
> I have traced this behaviour to the cpu hotplug code.
> 
> I need to be able to either switch off cpu hotpluging - or at least
> prevent hotplugging certain cpu's

The kernel doesn't automatically hotplug CPUs on idle. Something in your 
userspace is doing so. I think that Ubuntu's powernap will do so under 
certain circumstances - try disabling that if you have it.

(Which doesn't alter the fact that there appears to be a bug here)

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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