linux-kernel - Re: cpuidle asymmetry (was Re: [RFC PATCH V4 5/5] cpuidle: cpuidle driver for apm)

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Message-ID: <1301577536.4859.249.camel@twins>
Date:	Thu, 31 Mar 2011 15:18:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Len Brown <lenb@...nel.org>
Cc:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>,
	arjan@...ux.intel.com, Stephen Rothwell <sfr@...b.auug.org.au>,
	suresh.b.siddha@...el.com, benh@...nel.crashing.org,
	venki@...gle.com, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com
Subject: Re: cpuidle asymmetry (was Re: [RFC PATCH V4 5/5] cpuidle: cpuidle
 driver for apm)

On Wed, 2011-03-30 at 22:17 -0400, Len Brown wrote:
> 
> Moorestown is already an example of an asymmetric system,
> since its deepest c-state is available on cpu0, but not on cpu1.
> So it needs different tables for each cpu. 

wtf are these hardware guys smoking and how the heck are we supposed to
schedule on such a machine? Prefer to keep cpu1 busy while idling cpu0?
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