From mboxrd@z Thu Jan 1 00:00:00 1970 From: Muthusamy Subject: Re: unable to get load latency info Date: Sun, 2 Mar 2014 21:12:58 -0800 (PST) Message-ID: <1393823578.5408.YahooMailNeo@web125402.mail.ne1.yahoo.com> References: <1393568679.86476.YahooMailNeo@web125402.mail.ne1.yahoo.com> <87bnxrcq0y.fsf@tassilo.jf.intel.com> <531095B3.3070800@bsc.es> <20140228164510.GU22728@two.firstfloor.org> Reply-To: Muthusamy Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from nm4-vm6.bullet.mail.ne1.yahoo.com ([98.138.91.97]:40138 "EHLO nm4-vm6.bullet.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751111AbaCCFM7 convert rfc822-to-8bit (ORCPT ); Mon, 3 Mar 2014 00:12:59 -0500 In-Reply-To: <20140228164510.GU22728@two.firstfloor.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Harald Servat , Andi Kleen , "linux-perf-users@vger.kernel.org" > On 28/02/14 14:42, Andi Kleen wrote: > I don't think r100b is a valid event on Westmere. Thanks for the replies. As=A0Harald Servat and others pointed I am now trying "perf mem record" [root@rafa cms]# ./perf mem record /bin/ls invalid or unsupported event: 'cpu/mem-loads/pp' Is this a issue with the (old) kernel version I am on or the CPU versio= n or both. Regards, Muthusamy C > On Friday, February 28, 2014 10:15 PM, Andi Kleen wrote: > >> =A0 what do you mean by use-latency here? I understood that PEBS = was >> able to report the number of core cycles that the load took to from >> some part of the memory hierarchy until it reached the CPU. >=20 > PEBS load/store latency reports the cycles from when the instruction > started issuing in the pipeline to the return of the value. That's no= t > quite the same, it can be much longer than the pure memory hierarchy > cost. >=20 >=20 > -Andi > -- > To unsubscribe from this list: send the line "unsubscribe=20 > linux-perf-users" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at=A0 http://vger.kernel.org/majordomo-info.html >=20