From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754480AbXGNFEd (ORCPT ); Sat, 14 Jul 2007 01:04:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751054AbXGNFE0 (ORCPT ); Sat, 14 Jul 2007 01:04:26 -0400 Received: from mail.gmx.net ([213.165.64.20]:60000 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750877AbXGNFEZ (ORCPT ); Sat, 14 Jul 2007 01:04:25 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/WfE9t+LzWkELTTN2FjSxnq2AXSQmmj9mVRWYTuX THtIb54RWLQVhp Subject: Re: x86 status was Re: -mm merge plans for 2.6.23 From: Mike Galbraith To: Roman Zippel Cc: Linus Torvalds , Andrea Arcangeli , Andi Kleen , Ingo Molnar , Andrew Morton , linux-kernel@vger.kernel.org, Thomas Gleixner , Arjan van de Ven , Chris Wright In-Reply-To: References: <20070710013152.ef2cd200.akpm@linux-foundation.org> <20070711174252.GA16793@elte.hu> <20070711211638.GE18767@one.firstfloor.org> <20070711214649.GK14435@v2.random> <1184302024.6709.11.camel@Homer.simpson.net> Content-Type: text/plain Date: Sat, 14 Jul 2007 07:04:16 +0200 Message-Id: <1184389456.6632.13.camel@Homer.simpson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2007-07-13 at 19:23 +0200, Roman Zippel wrote: > Hi, > > On Fri, 13 Jul 2007, Mike Galbraith wrote: > > > > The new scheduler does _a_lot_ of heavy 64 bit calculations without any > > > attempt to scale that down a little... > > > > See prio_to_weight[], prio_to_wmult[] and sysctl_sched_stat_granularity. > > Perhaps more can be done, but "without any attempt..." isn't accurate. > > Calculating these values at runtime would have been completely insane, the > alternative would be a crummy approximation, so using a lookup table is > actually a good thing. That's not the problem. I meant see usage. -Mike