Re: [Xen-devel] [PATCH 1/2] mwait_idle: Disable Baytrail Core and Module C6 auto-demotion

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

On 09/08/2014 02:22 PM, Jan Beulich wrote:
> > > > On 08.09.14 at 14:42, <ross.lagerwall@xxxxxxxxxx> wrote:
> > From: Len Brown <len.brown@xxxxxxxxx>
> >
> > Power efficiency improves on Baytrail (Intel Atom Processor E3000)
> > when C6 auto-demotion is disabled.
> >
> > Based on work by Srinidhi Kasagar <srinidhi.kasagar@xxxxxxxxx>.
> >
> > Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
> > Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> So we raced on pulling these over - I did so late last week too and
> just didn't get to send them out yet. On this one I in fact doubt
> (and sent a respective query to Len; no response yet) that the MSR
> handling is. Hence my ported over patch is a little different:
According to Intel's manual, those two registers have package scope, 
i.e. all processor cores in the package share the same MSR, so 
presumably the original commit is OK.
--
Ross Lagerwall

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