From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from penguin.netx4.com (embeddededge.com [209.113.146.155]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id 1C2C5679E7 for ; Thu, 16 Jun 2005 11:22:04 +1000 (EST) In-Reply-To: <8E342283C2100540AAC5D1030970547766F7B1@rcexc.racoms.loc> References: <8E342283C2100540AAC5D1030970547766F7B1@rcexc.racoms.loc> Mime-Version: 1.0 (Apple Message framework v622) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <6b2464f619ef5e336557fea3db91d42a@embeddededge.com> From: Dan Malek Date: Wed, 15 Jun 2005 21:21:56 -0400 To: "Schaefer-Hutter, Peter" Cc: linuxppc-embedded@ozlabs.org Subject: Re: 2.4.26 and MPC885 context switching time List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Jun 15, 2005, at 11:43 AM, Schaefer-Hutter, Peter wrote: > I basically used the two programs from > http://www.ibm.com/developerworks/linux/library/l-rt9/ That's a fine test, if you run it on various systems and compare the _relative_ results. There is more than context switching going on here. .... there aren't any MMU "problems" with the 8xx, it's likely to be the most efficient implementation of all systems that use software to support the MMU. The processor in general is very sensitive to many system architecture decisions, especially the system bus and DRAM configuration. Make certain you really understand what you have configured and how the tests you run are affected by that. Thanks. -- Dan