linux-kernel - Re: [linux-pm] [PATCH 8/8] intel_idle: create a native cpuidle driver for select intel processors

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Message-Id: <201005280946.32981.trenn@suse.de>
Date:	Fri, 28 May 2010 09:46:32 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Len Brown <lenb@...nel.org>
Cc:	linux-pm@...ts.linux-foundation.org, x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sfr@...b.auug.org.au
Subject: Re: [linux-pm] [PATCH 8/8] intel_idle: create a native cpuidle driver for select intel processors

On Friday 28 May 2010 03:44:16 Len Brown wrote:
> On Thu, 27 May 2010, Thomas Renninger wrote:
...
> > > This driver does not yet know about cpu online/offline
> > > and thus will not yet play well with cpu-hotplug.
I thought this is also about soft on/offlining.
> 
> > What means does not play well yet, suspend or manually offlining a
> > core will eventually (for sure?) hang the machine?
> 
> It means less power savings savings than optimal
> for processors not present at module load time.
Ok, not really sever...
> 
> > If this is known broken, should this already be spread through
> > linux-next?
> 
> If you know somebody with a system that supports CPU hot-add
> on one of the processors supported by intel_idle, and they
> are willing to test linux-next, please have them contact me.
Real CPU hotplug is broken with acpi processor driver as well,
eventually it got addressed lately. Anyway, not sever...

Thanks,

    Thomas

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