From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Sander Subject: Re: Measuring timer interrupt latency Date: Mon, 13 Apr 2009 12:56:59 +0200 Message-ID: <200904131256.59826.tstone@vlsi.informatik.tu-darmstadt.de> References: <002901c9bc03$54aa23d0$3f52c70a@dlh.st.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ansi_x3.4-1968" Content-Transfer-Encoding: 7bit To: "'rt-users'" Return-path: Received: from lnx503.hrz.tu-darmstadt.de ([130.83.156.232]:50620 "EHLO lnx503.hrz.tu-darmstadt.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752907AbZDMLFK (ORCPT ); Mon, 13 Apr 2009 07:05:10 -0400 Received: from mailserver3.hrz.tu-darmstadt.de (lnx505.hrz.tu-darmstadt.de [130.83.156.234]) by lnx503.hrz.tu-darmstadt.de (8.14.2/8.13.8/HRZ/PMX) with ESMTP id n3DAv3jV021905 for ; Mon, 13 Apr 2009 12:57:03 +0200 (envelope-from tstone@vlsi.informatik.tu-darmstadt.de) Received: from [213.157.27.17] (helo=IP-213157027017.dialin.heagmedianet.de) by mailserver3.hrz.tu-darmstadt.de with esmtpsa (TLS-1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.63) (envelope-from ) id 1LtJqZ-00059I-KT for linux-rt-users@vger.kernel.org; Mon, 13 Apr 2009 12:57:03 +0200 In-Reply-To: <002901c9bc03$54aa23d0$3f52c70a@dlh.st.com> Content-Disposition: inline Sender: linux-rt-users-owner@vger.kernel.org List-ID: HI Suresh > Is there any test program which captures interrupt latency (for x86) ? > I checked realfeel but it is user mode program and am not sure of its > accuracy. I've posted some code to this list on this 3.3.09 with the subject: "Latency measurement module". Which does exactly that. ableit with the small problem that the TSC is not in sync on AMD SMP machines. Regards Tim -- ''=~('(?{'.('._@@[~'^'^-)./^').'"'.('}@@~-]@_^__'^'))-^~<.;;-}').',$/})')