From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommitted scenario in PLE handler Date: Mon, 24 Sep 2012 18:05:57 +0200 Message-ID: <1348502757.11847.91.camel@twins> References: <20120921115942.27611.67488.sendpatchset@codeblue> <20120921120019.27611.66093.sendpatchset@codeblue> <50607BBE.8070507@redhat.com> <1348500861.11847.72.camel@twins> <50607F9B.7090701@redhat.com> <1348501929.11847.81.camel@twins> <50608323.9000603@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Cc: Raghavendra K T , "H. Peter Anvin" , Marcelo Tosatti , Ingo Molnar , Rik van Riel , Srikar , "Nikunj A. Dadhania" , KVM , Jiannan Ouyang , chegu vinod , "Andrew M. Theurer" , LKML , Srivatsa Vaddagiri , Gleb Natapov To: Avi Kivity Return-path: Received: from casper.infradead.org ([85.118.1.10]:41661 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756708Ab2IXQGH convert rfc822-to-8bit (ORCPT ); Mon, 24 Sep 2012 12:06:07 -0400 In-Reply-To: <50608323.9000603@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 :/ Also, who gives a hoot about virtual crap ;-)