From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S970148AbXEIDIs (ORCPT ); Tue, 8 May 2007 23:08:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755092AbXEIDIj (ORCPT ); Tue, 8 May 2007 23:08:39 -0400 Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:53937 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754654AbXEIDIj (ORCPT ); Tue, 8 May 2007 23:08:39 -0400 Date: Tue, 8 May 2007 20:08:38 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: Nick Piggin cc: Matt Mackall , akpm@linux-foundation.org, David Miller , linux-kernel@vger.kernel.org Subject: Re: + fix-spellings-of-slab-allocator-section-in-init-kconfig.patch added to -mm tree In-Reply-To: <46413A29.1000506@yahoo.com.au> Message-ID: References: <200705082302.l48N2KrZ004229@shell0.pdx.osdl.net> <20070509002307.GV11115@waste.org> <20070509012725.GZ11115@waste.org> <20070509021911.GB11115@waste.org> <4641353F.2000408@yahoo.com.au> <46413A29.1000506@yahoo.com.au> 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 On Wed, 9 May 2007, Nick Piggin wrote: > But that 4MB system might not even have 50 pages that you'd want to > use for slab. The problem here is that you trade off more objects (SLUB) against more flexibility (SLOB). We need some experiments with 4M systems to see how this works out. It may be better to be able to allocate more objects. I estimate that we will have a need for about 30 active slabs (note the low number comes about because SLUB will merge similar slabs together into one) on such a system. Most of those can have two pages. So you will likely still be better off with SLUB than SLOB.