Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 19 Dec 2002 17:24:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 19 Dec 2002 17:23:08 -0500 Received: from neon-gw-l3.transmeta.com ([63.209.4.196]:44553 "EHLO neon-gw.transmeta.com") by vger.kernel.org with ESMTP id ; Thu, 19 Dec 2002 17:22:30 -0500 Message-ID: <3E024880.4010802@transmeta.com> Date: Thu, 19 Dec 2002 14:30:24 -0800 From: "H. Peter Anvin" Organization: Transmeta Corporation User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3a) Gecko/20021119 X-Accept-Language: en, sv MIME-Version: 1.0 To: Pavel Machek CC: dean gaudet , Linus Torvalds , Dave Jones , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: Intel P6 vs P7 system call performance References:

<20021218235327.GC705@elf.ucw.cz> <3E0245C1.5060902@transmeta.com> <20021219222136.GC17941@atrey.karlin.mff.cuni.cz> <3E0246DE.2010608@transmeta.com> <20021219222614.GE17941@atrey.karlin.mff.cuni.cz> In-Reply-To: <20021219222614.GE17941@atrey.karlin.mff.cuni.cz> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 483 Lines: 16 Pavel Machek wrote: > > User on cpu1 reads time, communicates it to cpu2, but cpu2 is drifted > -50ns, so it reads time "before" time reported cpu1. And gets confused. > How can you get that communication to happen in < 50 ns? -hpa - 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/