From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261618AbTEIGCa (ORCPT ); Fri, 9 May 2003 02:02:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261722AbTEIGCa (ORCPT ); Fri, 9 May 2003 02:02:30 -0400 Received: from zcars0m9.nortelnetworks.com ([47.129.242.157]:51375 "EHLO zcars0m9.nortelnetworks.com") by vger.kernel.org with ESMTP id S261618AbTEIGC3 (ORCPT ); Fri, 9 May 2003 02:02:29 -0400 Message-ID: <3EBB4735.30701@nortelnetworks.com> Date: Fri, 09 May 2003 02:14:13 -0400 X-Sybari-Space: 00000000 00000000 00000000 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020204 X-Accept-Language: en-us MIME-Version: 1.0 To: William Lee Irwin III Cc: Davide Libenzi , Linux Kernel Mailing List Subject: Re: how to measure scheduler latency on powerpc? realfeel doesn't work due to /dev/rtc issues References: <3EBAD63C.4070808@nortelnetworks.com> <20030509001339.GQ8978@holomorphy.com> <20030509003825.GR8978@holomorphy.com> <3EBB25FD.7060809@nortelnetworks.com> <20030509042659.GS8978@holomorphy.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org William Lee Irwin III wrote: > Try the timebase instead. The timestamp is not hard to get. The problem is getting a medium-frequency (2KHz or so) hardware interrupt to drive the test. On intel, you can do this by programming /dev/rtc. This does not work in powerpc. Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com