From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262967AbUKYElI (ORCPT ); Wed, 24 Nov 2004 23:41:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262969AbUKYElI (ORCPT ); Wed, 24 Nov 2004 23:41:08 -0500 Received: from stat16.steeleye.com ([209.192.50.48]:41108 "EHLO hancock.sc.steeleye.com") by vger.kernel.org with ESMTP id S262967AbUKYElH (ORCPT ); Wed, 24 Nov 2004 23:41:07 -0500 Subject: Re: [PATCH] Work around for periodic do_gettimeofday hang From: James Bottomley To: Andrew Morton Cc: arjan@infradead.org, Linux Kernel In-Reply-To: <20041124203349.7982efb7.akpm@osdl.org> References: <1101314988.1714.194.camel@mulgrave> <1101323621.2811.24.camel@laptop.fenrus.org> <1101356864.4007.35.camel@mulgrave> <20041124203349.7982efb7.akpm@osdl.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 (1.0.8-9) Date: 24 Nov 2004 22:40:51 -0600 Message-Id: <1101357657.5428.39.camel@mulgrave> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2004-11-24 at 22:33, Andrew Morton wrote: > Silly question: how come do_gettimeofday() is hanging? That's what I don't know. like I said, the xtime seqlock seemed to be implicated, but I've never managed to trace it down. I also notice that under heavy load the system starts to lose time (at least according to ntp). I suspect there's something wrong with the PIT timer routine (since that's what voyager has to use) for adding lost ticks. James