linux-kernel - Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommitted scenario in PLE handler

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Message-ID: <50608608.4000507@redhat.com>
Date:	Mon, 24 Sep 2012 18:10:48 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, Jiannan Ouyang <ouyang@...pitt.edu>,
	chegu vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommitted
 scenario in PLE handler

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
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