From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262543AbULPCdt (ORCPT ); Wed, 15 Dec 2004 21:33:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262546AbULPCdt (ORCPT ); Wed, 15 Dec 2004 21:33:49 -0500 Received: from e31.co.us.ibm.com ([32.97.110.129]:8687 "EHLO e31.co.us.ibm.com") by vger.kernel.org with ESMTP id S262543AbULPCdr (ORCPT ); Wed, 15 Dec 2004 21:33:47 -0500 Subject: Re: USB making time drift [was Re: dynamic-hz] From: john stultz To: Pavel Machek Cc: Andrea Arcangeli , Zwane Mwaikambo , Con Kolivas , lkml In-Reply-To: <20041216005814.GA6285@elf.ucw.cz> References: <20041213112853.GS16322@dualathlon.random> <20041213124313.GB29426@atrey.karlin.mff.cuni.cz> <20041213125844.GY16322@dualathlon.random> <20041213191249.GB1052@elf.ucw.cz> <20041214023651.GT16322@dualathlon.random> <20041214095939.GC1063@elf.ucw.cz> <20041214152558.GB16322@dualathlon.random> <20041214220239.GA19221@elf.ucw.cz> <20041214231649.GR16322@dualathlon.random> <20041216005814.GA6285@elf.ucw.cz> Content-Type: text/plain Message-Id: <1103164425.20791.22.camel@cog.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Wed, 15 Dec 2004 18:33:46 -0800 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2004-12-15 at 16:58, Pavel Machek wrote: > Hi! > > > > How much drift do you see? > > > > huge drift, minutes per hour or similar. > > Okay, for your amusement, here's the evil > "do-few-msec-interrupt-latency" program. Ohhh! Awesome. I love it! I'm playing with it and I'm seeing occasional jumps forward in time (about an hour and 10mins, and then back). I'll start seeing if there isn't anything we can do a quick fix for. Also I'll use this to test the timeofday rework code I'm doing. Very nice! thanks! -john