From: Ingo Molnar Subject: Re: Pin-pointing the root of unusual application latencies Date: Wed, 25 Jul 2007 15:38:35 +0200 Message-ID: <20070725133835.GA17616@elte.hu> References: <469600F7.3060603@free.fr> <20070723095357.GA886@elte.hu> <46A4B7C2.1070304@free.fr> <20070723160442.GA7995@elte.hu> <46A5B8E3.4060004@free.fr> <46A74A58.1070704@free.fr> <20070725130536.GA12334@elte.hu> <46A74E05.50504@free.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org To: John Sigler Return-path: Received: from mx2.mail.elte.hu ([157.181.151.9]:51132 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759464AbXGYNil (ORCPT ); Wed, 25 Jul 2007 09:38:41 -0400 Content-Disposition: inline In-Reply-To: <46A74E05.50504@free.fr> Sender: linux-rt-users-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org * John Sigler wrote: > > does your test-app have higher priority than softirq--4 ? > > PID 4 is [softirq-timer/0] and has priority 50 in SCHED_FIFO. My > process has priority 80 in SCHED_RR. It is waiting for IRQ10. > > My user-space app has higher priority than everything except PID 2 > which is [posix_cpu_timer] well what priority does the IRQ 10 kernel thread have? It should be prio 80 too if it's in your critical path. Ingo