Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760593AbWLJJiB (ORCPT ); Sun, 10 Dec 2006 04:38:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760600AbWLJJiB (ORCPT ); Sun, 10 Dec 2006 04:38:01 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:57935 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760593AbWLJJiA (ORCPT ); Sun, 10 Dec 2006 04:38:00 -0500 Subject: Re: PAE/NX without performance drain? From: Arjan van de Ven To: John Richard Moser Cc: linux-kernel@vger.kernel.org In-Reply-To: <457B1F02.7030409@comcast.net> References: <457B1F02.7030409@comcast.net> Content-Type: text/plain Organization: Intel International BV Date: Sun, 10 Dec 2006 10:37:57 +0100 Message-Id: <1165743478.27217.187.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2.1 (2.8.2.1-2.fc6) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 773 Lines: 24 On Sat, 2006-12-09 at 15:39 -0500, John Richard Moser wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Apparently (as I've been told today) using a hardware NX bit in a 32-bit > x86 kernel requires PAE mode. PAE mode is enabled with HIGHMEM64, which > is (apparently) extremely slow. it's not extremely slow. there is a minor performance delta, sure, but to be honest that's a benchmark thing more than a real life thing. What did your measurements show that the slowdown was? And how did you measure this? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/