From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756745AbZKKHvE (ORCPT ); Wed, 11 Nov 2009 02:51:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755707AbZKKHvD (ORCPT ); Wed, 11 Nov 2009 02:51:03 -0500 Received: from smtprelay04.ispgateway.de ([80.67.31.27]:58231 "EHLO smtprelay04.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753761AbZKKHvC (ORCPT ); Wed, 11 Nov 2009 02:51:02 -0500 Message-ID: <4AFA6CEB.6020202@ladisch.de> Date: Wed, 11 Nov 2009 08:51:07 +0100 From: Clemens Ladisch User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: Dmitry Adamushko CC: Andreas Herrmann , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] x86, ucode-amd: Load ucode-patches once and not separately fo each CPU References: <20091110110601.GG30802@alberich.amd.com> <20091110110723.GH30802@alberich.amd.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Df-Sender: linux-kernel@cl.domainfactory-kunde.de Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dmitry Adamushko wrote: > btw., if we could safely assume that all the cpus after the ucode > upgrade share the same version/patch-level of ucode, we would be able > to cache a single ucode instance once and use it for all. I don't > recall anyone clearly stating that such multi-cpu-type systems can't > really exist. > > e.g. is it possible to have AMD systems with cpus which differ from > each other not only by their revisions (patch_level)? The Revision Guide for AMD Family 10h Processors (#41322) says, in section "Mixed Silicon Support", that the Opteron B steppings can be used with each other (DR-BA, DR-B2, DR-B3; CPUID 00100F2xh). Are different steppings considered equivalent? Clemens