From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933022Ab0JGOBc (ORCPT ); Thu, 7 Oct 2010 10:01:32 -0400 Received: from vpn.id2.novell.com ([195.33.99.129]:59433 "EHLO vpn.id2.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932745Ab0JGOBb convert rfc822-to-8bit (ORCPT ); Thu, 7 Oct 2010 10:01:31 -0400 Message-Id: <4CADEED9020000780001B44F@vpn.id2.novell.com> X-Mailer: Novell GroupWise Internet Agent 8.0.1 Date: Thu, 07 Oct 2010 15:01:29 +0100 From: "Jan Beulich" To: "H. Peter Anvin" Cc: Subject: Re: patch disabling use of PSE on Atom CPUs with a certain erratum References: <4CADAB3A020000780001B30A@vpn.id2.novell.com> <4CADCF23.5070800@zytor.com> In-Reply-To: <4CADCF23.5070800@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> On 07.10.10 at 15:46, "H. Peter Anvin" wrote: > On 10/07/2010 02:12 AM, Jan Beulich wrote: >> In commit 7a0fc404ae663776e96db43879a0fa24fec1fa3a you >> disable use of PSE, but I wonder how this can take any effect on >> 64-bit CPUs, as they use large pages during early boot already. >> Those pages, when use of PSE gets disabled, will get broken up >> into 4k pages in phys_pmd_init(), thus actually increasing the >> chances that you hit the erratum. >> >> What am I missing? >> > > Those Atoms don't have 64-bit support. That's different from what I found looking around on the web. Jan