From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: poison_obj latency Date: Wed, 27 Jun 2007 14:34:35 +0200 Message-ID: <20070627123435.GA24977@elte.hu> References: <200706271251.58092.m.gruber@tirol.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-rt-users@vger.kernel.org To: Manfred Gruber Return-path: Received: from mx3.mail.elte.hu ([157.181.1.138]:53537 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753703AbXF0Mep (ORCPT ); Wed, 27 Jun 2007 08:34:45 -0400 Content-Disposition: inline In-Reply-To: <200706271251.58092.m.gruber@tirol.com> Sender: linux-rt-users-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org * Manfred Gruber wrote: > hi ! > > I use a arm4vt ep93xx processor with 2.6.21.5-rt18. > When i run cyclictest with -i 10000 and -n -p 90 -b 1000 i see some strange > latencies in poison_obj. disable SLAB_DEBUG. And look into your 'dmesg' output, the -rt kernel will warn about any other kernel config options as well that are known to cause large latencies: VFS: Mounted root (ext3 filesystem) readonly. ***************************************************************************** * * * REMINDER, the following debugging option is turned on in your .config: * * * * CONFIG_SLAB * * * * it may increase runtime overhead and latencies. * * * ***************************************************************************** Freeing unused kernel memory: 324k freed Ingo