From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752112AbYKQUQy (ORCPT ); Mon, 17 Nov 2008 15:16:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752243AbYKQUQm (ORCPT ); Mon, 17 Nov 2008 15:16:42 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:60746 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752319AbYKQUQl (ORCPT ); Mon, 17 Nov 2008 15:16:41 -0500 Date: Mon, 17 Nov 2008 12:16:41 -0800 (PST) Message-Id: <20081117.121641.167690467.davem@davemloft.net> To: torvalds@linux-foundation.org Cc: mingo@elte.hu, dada1@cosmosbay.com, rjw@sisk.pl, linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org, cl@linux-foundation.org, efault@gmx.de, a.p.zijlstra@chello.nl, shemminger@vyatta.com Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 From: David Miller In-Reply-To: References: <20081117184951.GA5585@elte.hu> <20081117.113936.81699150.davem@davemloft.net> X-Mailer: Mew version 6.1 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Linus Torvalds Date: Mon, 17 Nov 2008 11:55:35 -0800 (PST) > So try to figure out why his (better) profile doesn't match your > (inferior) one, instead of asking him to do stupid things. It's some > difference in architectures, likely: maybe the sparc timekeeping is crap, > maybe it's a cache issue and sparc caches are crap, maybe it's something > where Niagara (is it niagara) has some oddness that shows up because it > has that odd four-threads+four-cores or whatever. It's on my workstation which is a much simpler 2 processor UltraSPARC-IIIi (1.5Ghz) system. And yes I will investigate, it's all I've been doing in my spare time these past few weeks. From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Date: Mon, 17 Nov 2008 12:16:41 -0800 (PST) Message-ID: <20081117.121641.167690467.davem@davemloft.net> References: <20081117184951.GA5585@elte.hu> <20081117.113936.81699150.davem@davemloft.net> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: Text/Plain; charset="us-ascii" To: torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org Cc: mingo-X9Un+BFzKDI@public.gmane.org, dada1-fPLkHRcR87vqlBn2x/YWAg@public.gmane.org, rjw-KKrjLPT3xs0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, efault-Mmb7MZpHnFY@public.gmane.org, a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org, shemminger-ZtmgI6mnKB3QT0dZR+AlfA@public.gmane.org From: Linus Torvalds Date: Mon, 17 Nov 2008 11:55:35 -0800 (PST) > So try to figure out why his (better) profile doesn't match your > (inferior) one, instead of asking him to do stupid things. It's some > difference in architectures, likely: maybe the sparc timekeeping is crap, > maybe it's a cache issue and sparc caches are crap, maybe it's something > where Niagara (is it niagara) has some oddness that shows up because it > has that odd four-threads+four-cores or whatever. It's on my workstation which is a much simpler 2 processor UltraSPARC-IIIi (1.5Ghz) system. And yes I will investigate, it's all I've been doing in my spare time these past few weeks.