Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264471AbTFKVXS (ORCPT ); Wed, 11 Jun 2003 17:23:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264447AbTFKVXS (ORCPT ); Wed, 11 Jun 2003 17:23:18 -0400 Received: from 66-122-194-202.ded.pacbell.net ([66.122.194.202]:12209 "HELO mail.keyresearch.com") by vger.kernel.org with SMTP id S264533AbTFKVXJ (ORCPT ); Wed, 11 Jun 2003 17:23:09 -0400 Subject: Re: [PATCH] New x86_64 time code for 2.5.70 From: "Bryan O'Sullivan" To: john stultz Cc: Andi Kleen , vojtech@suse.cz, discuss@x86-64.org, lkml In-Reply-To: <1055366609.18643.63.camel@w-jstultz2.beaverton.ibm.com> References: <1055357432.17154.77.camel@serpentine.internal.keyresearch.com> <20030611191815.GA30411@wotan.suse.de> <1055361411.17154.83.camel@serpentine.internal.keyresearch.com> <1055362249.17154.86.camel@serpentine.internal.keyresearch.com> <1055366609.18643.63.camel@w-jstultz2.beaverton.ibm.com> Content-Type: text/plain Message-Id: <1055367412.17154.100.camel@serpentine.internal.keyresearch.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.0 Date: 11 Jun 2003 14:36:52 -0700 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 831 Lines: 21 On Wed, 2003-06-11 at 14:23, john stultz wrote: > Hmmm. Thats likely part to blame for the lost-ticks code not working. I > believe tick_usec is calculated USER_HZ rather then HZ, so you'll be off > by an order of magnitude. I ran into the exact same problem. Unlikely. On my systems, the offset values are off by three orders of magnitude, and are always negative. There's a more basic error somewhere before that test. The actual impact of lost jiffies is pretty low, though. I've beaten vigorously on my systems with the time patch, and they don't lose timer interrupts.