Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommittedscenario in PLE handler

[Avi Kivity]

On 09/24/2012 06:21 PM, Avi Kivity wrote:
> On 09/24/2012 06:13 PM, Peter Zijlstra wrote:
> > On Mon, 2012-09-24 at 18:10 +0200, Avi Kivity wrote:
> >> > Its also still a LAPIC write -- disguised as an MSR though :/
> >> 
> >> It's probably a whole lot faster though. 
> > 
> > I've been told its not, I haven't tried it.
>
> I'll see if I can find a machine with it (don't see it on my Westmere,
> it's probably on one of the Bridges.  Or maybe the other Peter knows.
>
>

Before measuring TSC_DEADLINE, I measured writing to TMICT, it costs 32
cycles.  This is on a Sandy Bridge.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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