From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262772AbVHEAfo (ORCPT ); Thu, 4 Aug 2005 20:35:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262796AbVHEAfn (ORCPT ); Thu, 4 Aug 2005 20:35:43 -0400 Received: from mail04.syd.optusnet.com.au ([211.29.132.185]:24266 "EHLO mail04.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S262772AbVHEAfl (ORCPT ); Thu, 4 Aug 2005 20:35:41 -0400 From: Con Kolivas To: Marc Ballarin Subject: Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 Date: Fri, 5 Aug 2005 10:31:33 +1000 User-Agent: KMail/1.8.1 Cc: linux-kernel@vger.kernel.org, ck@vds.kolivas.org, tony@atomide.com, tuukka.tikkanen@elektrobit.com References: <200508031559.24704.kernel@kolivas.org> <20050805001244.65f41b4f.Ballarin.Marc@gmx.de> In-Reply-To: <20050805001244.65f41b4f.Ballarin.Marc@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200508051031.33949.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 5 Aug 2005 08:12 am, Marc Ballarin wrote: > On Wed, 3 Aug 2005 15:59:24 +1000 > > Con Kolivas wrote: > > This is the dynamic ticks patch for i386 as written by Tony Lindgen > > and Tuukka Tikkanen . > > Patch for 2.6.13-rc5 > > One issue (tested the -rc4 Version on -mm): > - on interrupt flood (ping -f) HZ goes down to 0-4 HZ. > This matches "ticks to skip" below. Coincidence? > > - ping -f complains: > .Warning: time of day goes back (-304us), taking countermeasures. > ... > .Warning: time of day goes back (-33us), taking countermeasures. > > Yet, system time _seems_ to be kept correctly. Interesting... It almost seems like if you throw enough interrupts at it the next_timer_interrupt function gets confused. I wonder if S390 and ARM are seeing this at all since (it seems to me) they use that function? Con