Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262297AbTEIGHo (ORCPT ); Fri, 9 May 2003 02:07:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262298AbTEIGHo (ORCPT ); Fri, 9 May 2003 02:07:44 -0400 Received: from holomorphy.com ([66.224.33.161]:56477 "EHLO holomorphy") by vger.kernel.org with ESMTP id S262297AbTEIGHk (ORCPT ); Fri, 9 May 2003 02:07:40 -0400 Date: Thu, 8 May 2003 23:20:08 -0700 From: William Lee Irwin III To: Chris Friesen 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 Message-ID: <20030509062008.GT8978@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Chris Friesen , Davide Libenzi , Linux Kernel Mailing List References: <3EBAD63C.4070808@nortelnetworks.com> <20030509001339.GQ8978@holomorphy.com> <20030509003825.GR8978@holomorphy.com> <3EBB25FD.7060809@nortelnetworks.com> <20030509042659.GS8978@holomorphy.com> <3EBB4735.30701@nortelnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3EBB4735.30701@nortelnetworks.com> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 721 Lines: 19 William Lee Irwin III wrote: >> Try the timebase instead. On Fri, May 09, 2003 at 02:14:13AM -0400, Chris Friesen wrote: > 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. I don't understand why you're obsessed with interrupts. Just run your load and spray the scheduler latency stats out /proc/ -- wli - 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/