Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760757AbXE2PVj (ORCPT ); Tue, 29 May 2007 11:21:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750838AbXE2PV3 (ORCPT ); Tue, 29 May 2007 11:21:29 -0400 Received: from mms2.broadcom.com ([216.31.210.18]:1569 "EHLO mms2.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750699AbXE2PV2 (ORCPT ); Tue, 29 May 2007 11:21:28 -0400 X-Server-Uuid: A6C4E0AE-A7F0-449F-BAE7-7FA0D737AC76 Subject: Re: b44: regression in 2.6.22 (resend) From: "Gary Zambrano" To: "Maximilian Engelhardt" cc: "Thomas Gleixner" , "Michael Buesch" , "linux-kernel" , "linux-wireless" , "Stephen Hemminger" , "Arnaldo Carvalho de Melo" , "Jeff Garzik" , netdev@vger.kernel.org, "Andrew Morton" In-Reply-To: <200705282255.56490.maxi@daemonizer.de> References: <20070525172431.60affaca@freepuppy> <200705281944.05030.maxi@daemonizer.de> <1180380230.3657.3.camel@chaos> <200705282255.56490.maxi@daemonizer.de> Date: Tue, 29 May 2007 06:58:43 -0700 Message-ID: <1180447123.17146.4.camel@dhcp-10-12-136-115.broadcom.com> MIME-Version: 1.0 X-Mailer: Evolution 2.2.2 (2.2.2-5) X-WSS-ID: 6A429B603CG1520377-01-01 Content-Type: text/plain Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2093 Lines: 58 On Mon, 2007-05-28 at 13:55 -0700, Maximilian Engelhardt wrote: > On Monday 28 May 2007, Thomas Gleixner wrote: > > On Mon, 2007-05-28 at 19:44 +0200, Maximilian Engelhardt wrote: > > > > Can you please keep CONFIG_HIGH_RES_TIMERS and CONFIG_NOHZ and try the > > > > following combinations on the kernel command line: > > > > > > > > 1) highres=off nohz=off (should be the same as your working config) > > > > 2) highres=off > > > > 3) nohz=off > > > > > > I tested this with my 2.6.22-rc3 kernel, here are the results: > > > > > > without any special boot parameters: problem does appear > > > highres=off nohz=off: problem does not appear > > > highres=off: problem does not appear > > > nohz=off: problem does appear > > > > Is there any other strange behavior of the high res enabled kernel than > > the b44 problem ? > > I didn't notice anything. > > > > > > I additionally built my 2.6.22-rc2-mm1 kernel without High Resolution > > > Timer, but the high ping problem is still there. > > > > Hmm, that's mysterious. Wild guess is that highres exposes the hidden > > "feature" in a different way than rc2-mm1 does. > > I think the bug in 2.6.21/22-rc3 is a different one that the one in > 2.6.22-rc2-mm1, but that's also only a wild guess :) > > I'll explain this a bit: > In 2.6.21/22-rc3 is the same b44 driver that has been in the stock kernels for > some time. With this driver and High Resolution Timer turned on I get > problems using iperf. The problems are that the systems becomes really slow > and unresponsive. Michael Buesch thought this could be an IRQ storm which > sounds logical to me. This bug did never happen to me before I startet the > iperf test. Can you please check to see if you notice anything out of the ordinary using netperf in place of iperf in your high res timer on/off testbed? Thanks, Gary - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/