Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1767555AbXEDAoW (ORCPT ); Thu, 3 May 2007 20:44:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1767554AbXEDAoW (ORCPT ); Thu, 3 May 2007 20:44:22 -0400 Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:56627 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1767552AbXEDAoV (ORCPT ); Thu, 3 May 2007 20:44:21 -0400 Date: Thu, 3 May 2007 17:44:19 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: "Chen, Tim C" cc: Tim Chen , "Siddha, Suresh B" , "Zhang, Yanmin" , "Wang, Peter Xihong" , Arjan van de Ven , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: RE: Regression with SLUB on Netperf and Volanomark In-Reply-To: <9D2C22909C6E774EBFB8B5583AE5291C02786032@fmsmsx414.amr.corp.intel.com> Message-ID: References: <9D2C22909C6E774EBFB8B5583AE5291C02786032@fmsmsx414.amr.corp.intel.com> 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 Content-Length: 1265 Lines: 28 On Thu, 3 May 2007, Chen, Tim C wrote: > We are still seeing a 5% regression on TCP streaming with > slub_min_objects set at 16 and a 10% regression for Volanomark, after > increasing slub_min_objects to 16 and setting slub_max_order=4 and using > the 2.6.21-rc7-mm2 kernel. The performance between slub_min_objects=8 > and 16 are similar. Ok. We then need to look at partial list management. It could be that the sequence of partials is reversed. The problem is that I do not really have time to concentrate on performance right now. Stability comes first. We will likely end up putting some probes in there to find out where the overhead comes from. > > Check slabinfo output for the network slabs and see what order is > > used. The number of objects per slab is important for performance. > > The order used is 0 for the buffer_head, which is the most used object. > > I think they are 104 bytes per object. Hmmm.... Then it was not affected by slab_max_order? Try slab_min_order=1 or 2 to increase that? - 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/