Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758805AbYAPWel (ORCPT ); Wed, 16 Jan 2008 17:34:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754896AbYAPW2r (ORCPT ); Wed, 16 Jan 2008 17:28:47 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:45186 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757892AbYAPW2p (ORCPT ); Wed, 16 Jan 2008 17:28:45 -0500 Date: Wed, 16 Jan 2008 14:28:44 -0800 (PST) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: Matthew Wilcox cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: SLUB: Increasing partial pages In-Reply-To: <20080116221618.GB11559@parisc-linux.org> Message-ID: References: <20080116195949.GO18741@parisc-linux.org> <20080116214127.GA11559@parisc-linux.org> <20080116221618.GB11559@parisc-linux.org> 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: 861 Lines: 18 On Wed, 16 Jan 2008, Matthew Wilcox wrote: > About 0.1-0.2% 0.3% is considered significant. The results are that stable? A kernel compilation which slightly rearranges cachelines due to code and data changes typically leads to a larger variance on my 8 way box (gets even larger under NUMA). I would expect that the variations on a database load would be more significant. I repeatedly saw patches from Intel to do minor changes to SLAB that increase performance by 0.5% or so (like the recent removal of a BUG_ON for performance reasons). These do not regress again when you build a newer kernel release? -- 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/