Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 8 Dec 2001 12:43:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 8 Dec 2001 12:43:37 -0500 Received: from e21.nc.us.ibm.com ([32.97.136.227]:45229 "EHLO e21.nc.us.ibm.com") by vger.kernel.org with ESMTP id ; Sat, 8 Dec 2001 12:43:24 -0500 Subject: Re: [Lse-tech] [RFC] [PATCH] Scalable Statistics Counters To: Anton Blanchard Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org X-Mailer: Lotus Notes Release 5.0.7 March 21, 2001 Message-ID: From: "Niels Christiansen" Date: Sat, 8 Dec 2001 12:43:22 -0500 X-MIMETrack: Serialize by Router on D04NM104/04/M/IBM(Release 5.0.8 |June 18, 2001) at 12/08/2001 12:43:23 PM MIME-Version: 1.0 Content-type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Anton Blanchard wrote: | > > There's several things where per cpu data is useful; low frequency | > > statistics is not one of them in my opinion. | > | > ...which may be true for 4-ways and even 8-ways but when you get to | > 32-ways and greater, you start seeing cache problems. That was the | > case on AIX and per-cpu counters was one of the changes that helped | > get the spectacular scalability on Regatta. | | I agree there are large areas of improvement to be done wrt cacheline | ping ponging (see my patch in 2.4.17-pre6 for one example), but we | should do our own benchmarking and not look at what AIX has been doing. Oh, please! You voiced an opinion. I presented facts. Nobody suggested we should not measure on Linux. As a matter of fact, I suggested that Kiran does tests on the real counters and he said he would. Niels - 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/