From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751383AbWFYFC7 (ORCPT ); Sun, 25 Jun 2006 01:02:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751397AbWFYFC7 (ORCPT ); Sun, 25 Jun 2006 01:02:59 -0400 Received: from mail.gmx.de ([213.165.64.21]:12512 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S1751383AbWFYFC6 (ORCPT ); Sun, 25 Jun 2006 01:02:58 -0400 X-Authenticated: #14349625 Subject: Re: Measuring tools - top and interrupts From: Mike Galbraith To: =?ISO-8859-1?Q?Bj=F6rn?= Steinbrink Cc: danial_thom@yahoo.com, linux-kernel@vger.kernel.org In-Reply-To: <20060624192523.GA3231@atjola.homenet> References: <20060622165808.71704.qmail@web33303.mail.mud.yahoo.com> <1151128763.7795.9.camel@Homer.TheSimpsons.net> <1151130383.7545.1.camel@Homer.TheSimpsons.net> <20060624092156.GA13142@atjola.homenet> <1151142716.7797.10.camel@Homer.TheSimpsons.net> <1151149317.7646.14.camel@Homer.TheSimpsons.net> <20060624154037.GA2946@atjola.homenet> <1151166193.8516.8.camel@Homer.TheSimpsons.net> <20060624192523.GA3231@atjola.homenet> Content-Type: text/plain; charset=utf-8 Date: Sun, 25 Jun 2006 07:06:33 +0200 Message-Id: <1151211993.8519.6.camel@Homer.TheSimpsons.net> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 8bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2006-06-24 at 21:25 +0200, Björn Steinbrink wrote: > On 2006.06.24 18:23:12 +0200, Mike Galbraith wrote: > > > > let's see. Yeah, confirmed. > > OK, it also depends on IO APIC being enabled and active, ie. noapic on > the kernel command line will fix it as well as disabling > CONFIG_X86_IO_APIC. That doesn't help me at all to understand why it > happens though. Ditto. > The only difference with IO APIC disabled seems to be that the irq > doesn't get ACKed before update_process_times() gets called. > And your "fix" makes it being called outside of the xtime_lock spinlock > and with a slightly different stack usage AFAICT. (it's still under the xtime lock) > But none of these should make a difference, right? Not that I can see, but then it's pretty dark down here. Anybody got a flashlight I can borrow? ;-) -Mike