Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 17 Dec 2002 16:31:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 17 Dec 2002 16:31:59 -0500 Received: from to-velocet.redhat.com ([216.138.202.10]:35057 "EHLO touchme.toronto.redhat.com") by vger.kernel.org with ESMTP id ; Tue, 17 Dec 2002 16:31:56 -0500 Date: Tue, 17 Dec 2002 16:39:54 -0500 From: Benjamin LaHaise To: "H. Peter Anvin" Cc: dean gaudet , Linus Torvalds , Dave Jones , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: Intel P6 vs P7 system call performance Message-ID: <20021217163954.D10781@redhat.com> References:

<3DFF76D7.2050403@transmeta.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <3DFF76D7.2050403@transmeta.com>; from hpa@transmeta.com on Tue, Dec 17, 2002 at 11:11:19AM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 690 Lines: 19 On Tue, Dec 17, 2002 at 11:11:19AM -0800, H. Peter Anvin wrote: > > against 0xfffffxxx and "rollback" (or complete) any incomplete > > gettimeofday call prior to saving a task's state. but i bet that test is > > undesirable on all interrupt paths. > > > > Exactly. This is a real problem. No, just take the number of context switches before and after the attempt to read the time of day. -ben -- "Do you seek knowledge in time travel?" - 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/