From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761327AbZFSWip (ORCPT ); Fri, 19 Jun 2009 18:38:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760235AbZFSWed (ORCPT ); Fri, 19 Jun 2009 18:34:33 -0400 Received: from sprinkles.athenacr.com ([64.95.46.210]:1026 "EHLO sprinkles.inp.in.athenacr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1760213AbZFSWec (ORCPT ); Fri, 19 Jun 2009 18:34:32 -0400 Message-ID: <4A3C1279.6040506@athenacr.com> Date: Fri, 19 Jun 2009 18:34:33 -0400 From: Brian Bloniarz User-Agent: Thunderbird 2.0.0.21 (X11/20090318) MIME-Version: 1.0 To: mingo@elte.hu, linux-kernel@vger.kernel.org Subject: Re: gettimeofday() time warps on Nehalem References: <4A3BAAE8.3030606@athenacr.com> In-Reply-To: <4A3BAAE8.3030606@athenacr.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Brian Bloniarz wrote: > $ ./time-warp-test > 16 CPUs, running 16 parallel test-tasks. > checking for time-warps via: > - gettimeofday (TOD) syscall (usec resolution) > > new TOD-warp maximum: -1 usecs, 00046cb465acb046 -> 00046cb465acb045 > new TOD-warp maximum: -2 usecs, 00046cb465ad7515 -> 00046cb465ad7513 > TOD: 0.26us, fail:21534 \ Ignore this. I killed NTP before running these tests, but it looks now like a script from my distro restarted it. I can no longer reproduce the problem, sorry for the noise. Thanks, -Brian