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Date: Mon, 24 Sep 2012 18:10:48 +0200
From: Avi Kivity <avi@redhat.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Marcelo Tosatti <mtosatti@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Rik van Riel <riel@redhat.com>, Srikar <srikar@linux.vnet.ibm.com>,
        "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>,
        KVM <kvm@vger.kernel.org>, Jiannan Ouyang <ouyang@cs.pitt.edu>,
        chegu vinod <chegu_vinod@hp.com>,
        "Andrew M. Theurer" <habanero@linux.vnet.ibm.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Srivatsa Vaddagiri <srivatsa.vaddagiri@gmail.com>,
        Gleb Natapov <gleb@redhat.com>
Subject: Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommitted
 scenario in PLE handler
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On 09/24/2012 06:05 PM, Peter Zijlstra wrote:
> On Mon, 2012-09-24 at 17:58 +0200, Avi Kivity wrote:
>> There is the TSC deadline timer mode of newer Intels.  Programming the
>> timer is a simple wrmsr, and it will fire immediately if it already
>> expired.  Unfortunately on AMDs it is not available, and on virtual
>> hardware it will be slow (~1-2 usec). 
> 
> Its also still a LAPIC write -- disguised as an MSR though :/

It's probably a whole lot faster though.

> Also, who gives a hoot about virtual crap ;-)

I only mentioned it to see if your virtual crap detector is still
working.  Looks like it's still in top condition, low latency and 100%
hit rate.

-- 
error compiling committee.c: too many arguments to function