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Message-id: <alpine.LFD.2.02.1104010006210.2797@x980> Date: Fri, 01 Apr 2011 00:09:25 -0400 (EDT) From: Len Brown <lenb@...nel.org> To: Peter Zijlstra <peterz@...radead.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) > > 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? they are smoking micro-amps:-) S0i3 on cpu0 can be entered only after cpu1 is already off-line, among other system hardware dependencies... So it makes no sense to export S0i3 as a c-state on cpu1. When cpu1 is online, the scheduler treats it as a normal SMP. cheers, -Len Brown, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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