From owner-cvs-src@FreeBSD.ORG Sun May 15 20:30:12 2005 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 40F5A16A4CE; Sun, 15 May 2005 20:30:11 +0000 (GMT) Received: from pd3mo1so.prod.shaw.ca (shawidc-mo1.cg.shawcable.net [24.71.223.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id AFEE143D8D; Sun, 15 May 2005 20:30:11 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd4mr1so.prod.shaw.ca (pd4mr1so-qfe3.prod.shaw.ca [10.0.141.212]) by l-daemon (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0IGJ00HDBSXA2P30@l-daemon>; Sun, 15 May 2005 14:29:34 -0600 (MDT) Received: from pn2ml3so.prod.shaw.ca ([10.0.121.147]) by pd4mr1so.prod.shaw.ca (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0IGJ00MWWSXA2EJ0@pd4mr1so.prod.shaw.ca>; Sun, 15 May 2005 14:29:34 -0600 (MDT) Received: from [192.168.0.60] (S0106006067227a4a.vc.shawcable.net [24.87.209.6]) by l-daemon (iPlanet Messaging Server 5.2 HotFix 1.18 (built Jul 28 2003)) with ESMTP id <0IGJ00GT6SX9WB@l-daemon>; Sun, 15 May 2005 14:29:34 -0600 (MDT) Date: Sun, 15 May 2005 16:29:32 -0400 From: Colin Percival In-reply-to: <4287AD84.6070600@root.org> To: Nate Lawson Message-id: <4287B12C.9080903@freebsd.org> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 7bit X-Accept-Language: en-us, en X-Enigmail-Version: 0.91.0.0 References: <97079.1116154766@critter.freebsd.dk> <4287AD84.6070600@root.org> User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050406) cc: Jacques Vidrine cc: cvs-src@freebsd.org cc: Poul-Henning Kamp cc: src-committers@freebsd.org cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/amd64/amd64 mp_machdep.csrc/sys/amd64/include cpufunc.h src/sys/i386/i386 mp_machdep.c src/sys/i386/include cpufunc.h X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 May 2005 20:30:12 -0000 Nate Lawson wrote: > Every general-purpose machine has measurable timing side channels. The > question is merely one of bandwidth. Absolutely. Most covert channels operate at up to a few kbps; this covert channel operates at several Mbps. The fact that this channel is many times faster than all the other channels combined makes it not just quantitatively different but also qualitatively different and deserving of more careful treatment. Colin Percival