From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757054Ab3J1PXT (ORCPT ); Mon, 28 Oct 2013 11:23:19 -0400 Received: from mail.skyhub.de ([78.46.96.112]:46632 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757019Ab3J1PXR (ORCPT ); Mon, 28 Oct 2013 11:23:17 -0400 Date: Mon, 28 Oct 2013 16:23:14 +0100 From: Borislav Petkov To: Henrique de Moraes Holschuh Cc: Prarit Bhargava , linux-kernel@vger.kernel.org, tigran@aivazian.fsnet.co.uk, x86@kernel.org, andi@firstfloor.org Subject: Re: [PATCH] x86, microcode, Fix long microcode load time when firmware file is missing [v2] Message-ID: <20131028152314.GN4314@pd.tnic> References: <1382961968-20067-1-git-send-email-prarit@redhat.com> <20131028143714.GL4314@pd.tnic> <20131028150656.GA15440@khazad-dum.debian.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20131028150656.GA15440@khazad-dum.debian.net> 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 Mon, Oct 28, 2013 at 01:06:56PM -0200, Henrique de Moraes Holschuh wrote: > AMD can get away with a half-done implementation of negative caching > (or an "optimised one" depending on your PoV :) ) because they have > per-family firmware files, so even mixed-stepping systems will require > only the same file. This is *not* true for Intel, which is really > annoying. Not per family but per-a-couple-of-families and starting with F15h we did a separate container because of some obscure reason we had to dance around at the time. But per-family is enough because I hardly doubt any x86 vendor would do mixed-setups of CPUs from different families. It is called mixed-steppings for a reason: you can mix the same family and model CPUs but with different steppings. And I think AMD had a K8 system which sported that. Mixing different families (and models for that matter) would be pretty PITA and you're better off simply buying a bunch of identical CPUs :-) -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --