From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758138AbZEKPTA (ORCPT ); Mon, 11 May 2009 11:19:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755074AbZEKPSs (ORCPT ); Mon, 11 May 2009 11:18:48 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:43310 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754647AbZEKPSr (ORCPT ); Mon, 11 May 2009 11:18:47 -0400 Date: Mon, 11 May 2009 17:18:23 +0200 From: Ingo Molnar To: Avi Kivity Cc: Peter Zijlstra , Mark Langsdorf , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH][KVM][retry 1] Add support for Pause Filtering to AMD SVM Message-ID: <20090511151823.GC9492@elte.hu> References: <200905050909.58583.mark.langsdorf@amd.com> <20090507135522.GJ4059@amd.com> <200905071000.14038.mark.langsdorf@amd.com> <4A02FECC.6060609@redhat.com> <20090511141503.GC6175@elte.hu> <4A083539.407@redhat.com> <20090511143320.GE6175@elte.hu> <4A083B69.6010702@redhat.com> <20090511145903.GB737@elte.hu> <4A08405E.3070709@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A08405E.3070709@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Avi Kivity wrote: >> I.e. the 3000 cycles value itself could be eliminated as well. >> (with just a common-sense max of say 100,000 cycles enforced) > > Yeah, though that has a much smaller effect as it's only > responsible for a few microseconds of spinning. 3000 cycles would be 1-2 usecs. Isnt the VM exit+entry cost still in that range? Ingo