From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753844Ab1G0QnQ (ORCPT ); Wed, 27 Jul 2011 12:43:16 -0400 Received: from s15228384.onlinehome-server.info ([87.106.30.177]:42836 "EHLO mail.x86-64.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753341Ab1G0QnN (ORCPT ); Wed, 27 Jul 2011 12:43:13 -0400 Date: Wed, 27 Jul 2011 18:42:57 +0200 From: Borislav Petkov To: Avi Kivity Cc: Borislav Petkov , Ingo Molnar , "Przywara, Andre" , "H. Peter Anvin" , Thomas Gleixner , LKML , "Pohlack, Martin" Subject: Re: [PATCH] x86, AMD: Correct F15h IC aliasing issue Message-ID: <20110727164257.GC19477@aftab> References: <4E2F09BB.9060605@zytor.com> <4E2F1889.8030708@amd.com> <4E2F90A2.4030409@redhat.com> <20110727062120.GA5272@aftab> <20110727065932.GA16555@elte.hu> <4E2FDAD0.8000809@redhat.com> <20110727153731.GA19477@aftab> <4E30327C.5020509@redhat.com> <20110727154957.GB19477@aftab> <4E303579.4000903@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4E303579.4000903@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 27, 2011 at 11:57:45AM -0400, Avi Kivity wrote: > Out of curiosity, what's the performance impact if the workaround is > not enabled? Up to 3% for a CPU-intensive style benchmark, and it can vary highly in a microbenchmark depending on workload and compiler. -- Regards/Gruss, Boris. Advanced Micro Devices GmbH Einsteinring 24, 85609 Dornach GM: Alberto Bozzo Reg: Dornach, Landkreis Muenchen HRB Nr. 43632 WEEE Registernr: 129 19551