Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 18 Dec 2002 10:02:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 18 Dec 2002 10:02:47 -0500 Received: from pc2-cwma1-4-cust86.swan.cable.ntl.com ([213.105.254.86]:27367 "EHLO irongate.swansea.linux.org.uk") by vger.kernel.org with ESMTP id ; Wed, 18 Dec 2002 10:02:47 -0500 Subject: Re: Intel P6 vs P7 system call performance From: Alan Cox To: Jeremy Fitzhardinge Cc: Linus Torvalds , Ulrich Drepper , Matti Aarnio , Hugh Dickins , Dave Jones , Ingo Molnar , Linux Kernel Mailing List , "H. Peter Anvin" In-Reply-To: <1040189657.1562.11.camel@ixodes.goop.org> References: <1040189657.1562.11.camel@ixodes.goop.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 (1.0.8-10) Date: 18 Dec 2002 15:50:53 +0000 Message-Id: <1040226653.24530.6.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 718 Lines: 15 On Wed, 2002-12-18 at 05:34, Jeremy Fitzhardinge wrote: > The P4 optimisation guide promises horrible things if you write within > 2k of a cached instruction from another CPU (it dumps the whole trace > cache, it seems), so you'd need to be careful about mixing mutable data > and the syscall code in that page. The PIII errata promise worse things with SMP and code modified as another cpu ruins it and seems to mark them WONTFIX, so there is another dragon to beware of - 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/