Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757547AbZAWP6A (ORCPT ); Fri, 23 Jan 2009 10:58:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756960AbZAWP5I (ORCPT ); Fri, 23 Jan 2009 10:57:08 -0500 Received: from smtp.ultrahosting.com ([74.213.174.254]:38594 "EHLO smtp.ultrahosting.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756744AbZAWP5G (ORCPT ); Fri, 23 Jan 2009 10:57:06 -0500 Date: Fri, 23 Jan 2009 10:22:16 -0500 (EST) From: Christoph Lameter X-X-Sender: cl@qirst.com To: Pekka Enberg cc: "Zhang, Yanmin" , Andi Kleen , Matthew Wilcox , Nick Piggin , Andrew Morton , netdev@vger.kernel.org, Stephen Rothwell , matthew.r.wilcox@intel.com, chinang.ma@intel.com, linux-kernel@vger.kernel.org, sharad.c.tripathi@intel.com, arjan@linux.intel.com, suresh.b.siddha@intel.com, harita.chilukuri@intel.com, douglas.w.styner@intel.com, peter.xihong.wang@intel.com, hubert.nueckel@intel.com, chris.mason@oracle.com, srostedt@redhat.com, linux-scsi@vger.kernel.org, andrew.vasquez@qlogic.com, anirban.chakraborty@qlogic.com, Ingo Molnar Subject: Re: Mainline kernel OLTP performance update In-Reply-To: <1232703989.6094.29.camel@penberg-laptop> Message-ID: References: <200901161503.13730.nickpiggin@yahoo.com.au> <20090115201210.ca1a9542.akpm@linux-foundation.org> <200901161746.25205.nickpiggin@yahoo.com.au> <20090116065546.GJ31013@parisc-linux.org> <1232092430.11429.52.camel@ymzhang> <87sknjeemn.fsf@basil.nowhere.org> <1232428583.11429.83.camel@ymzhang> <1232613395.11429.122.camel@ymzhang> <1232615707.14549.6.camel@penberg-laptop> <1232616517.11429.129.camel@ymzhang> <1232617672.14549.25.camel@penberg-laptop> <1232679773.11429.155.camel@ymzhang> <4979692B.3050703@cs.helsinki.fi> <1232697998.6094.17.camel@penberg-laptop> <1232699401.11429.163.camel@ymzhang> <1232703989.6094.29.camel@penberg-laptop> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 826 Lines: 18 On Fri, 23 Jan 2009, Pekka Enberg wrote: > Looking at __slab_free(), unless page->inuse is constantly zero and we > discard the slab, it really is just cache effects (10% sounds like a > lot, though!). AFAICT, the only way to optimize that is with Christoph's > unfinished pointer freelists patches or with a remote free list like in > SLQB. No there is another way. Increase the allocator order to 3 for the kmalloc-8192 slab then multiple 8k blocks can be allocated from one of the larger chunks of data gotten from the page allocator. That will allow slub to do fast allocs. -- 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/