Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932296AbVJKSoa (ORCPT ); Tue, 11 Oct 2005 14:44:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932294AbVJKSoa (ORCPT ); Tue, 11 Oct 2005 14:44:30 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:18144 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S932296AbVJKSo3 (ORCPT ); Tue, 11 Oct 2005 14:44:29 -0400 Subject: Re: 2.6.13-rt12: irqs hard off for 657 usecs From: Lee Revell To: Ingo Molnar Cc: linux-kernel In-Reply-To: <1129048106.12702.21.camel@mindpipe> References: <1128724690.17981.57.camel@mindpipe> <20051011112043.GB15995@elte.hu> <1129048106.12702.21.camel@mindpipe> Content-Type: text/plain Date: Tue, 11 Oct 2005 14:44:28 -0400 Message-Id: <1129056268.4718.1.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 911 Lines: 25 On Tue, 2005-10-11 at 12:28 -0400, Lee Revell wrote: > On Tue, 2005-10-11 at 13:20 +0200, Ingo Molnar wrote: > > * Lee Revell wrote: > > > > > Something appears to have disabled IRQs for 657 usecs. > > > > how hard is it to reproduce this latency? > > Very easy. Here's the current max latency. > > The max latency is close to the period of the timer IRQ. So either it's > an instrumentation bug or something really disables IRQs for up to 1/HZ > seconds. I can no longer reproduce this with 2.6.14-rc4-rt1. It seems to have been a real IRQs disabled bug (not an instrumentation bug) as I was also getting xruns with 2.6.13-rt12. Lee - 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/