Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262287AbTEIEAf (ORCPT ); Fri, 9 May 2003 00:00:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262289AbTEIEAf (ORCPT ); Fri, 9 May 2003 00:00:35 -0400 Received: from webmail.netapps.org ([12.162.17.40]:62687 "EHLO umhlanga.STRATNET.NET") by vger.kernel.org with ESMTP id S262287AbTEIEAe (ORCPT ); Fri, 9 May 2003 00:00:34 -0400 To: Chris Friesen Cc: 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> X-Message-Flag: Warning: May contain useful information X-Priority: 1 X-MSMail-Priority: High From: Roland Dreier Date: 08 May 2003 21:13:09 -0700 In-Reply-To: <3EBB25FD.7060809@nortelnetworks.com> Message-ID: <52k7d0lpuy.fsf@topspin.com> User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Common Lisp) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 09 May 2003 04:13:11.0561 (UTC) FILETIME=[4DEB7F90:01C315E1] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 794 Lines: 13 Chris> I want to find an additional programmable interrupt source. Chris> It bites that cheap PCs have this, and the powerpc doesn't. I don't know which PowerPC CPU you are using, but for example the IBM 4xx series (and all Book E processors) have a "fixed interval timer" interrupt that is currently not used at all by Linux. (The "programmable interval timer" is used to increment jiffies) On something like the Motorola 74xx, you might be able to use the something like the performance monitor to generate an exception. Best, Roland - 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/