Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753976AbYCNGdn (ORCPT ); Fri, 14 Mar 2008 02:33:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751506AbYCNGde (ORCPT ); Fri, 14 Mar 2008 02:33:34 -0400 Received: from relay2.sgi.com ([192.48.171.30]:56107 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751347AbYCNGde (ORCPT ); Fri, 14 Mar 2008 02:33:34 -0400 Date: Thu, 13 Mar 2008 23:32:39 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: "Zhang, Yanmin" cc: Andrew Morton , Kay Sievers , Greg Kroah-Hartman , LKML , Ingo Molnar Subject: Re: hackbench regression since 2.6.25-rc In-Reply-To: <1205463842.3215.188.camel@ymzhang> Message-ID: References: <1205394417.3215.85.camel@ymzhang> <20080313014808.f8d25c2a.akpm@linux-foundation.org> <1205400538.3215.148.camel@ymzhang> <1205463842.3215.188.camel@ymzhang> 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: 1099 Lines: 32 On Fri, 14 Mar 2008, Zhang, Yanmin wrote: > After testing: > Name Objects Alloc Free %Fast > :0000192 3428 80093958 80090708 92 8 > :0000512 374 80016030 80015715 68 7 Ahhh... Okay those slabs did not change for 2.6.25-rc. Is there really a difference to 2.6.24? > So block 192 and 512's and very active and their fast free percentage is low. Yes but that is to be expected given that hackbench does allocate objects and then passes them to other processors for freeing. Could you get me more details on the two critical slabs? Do slabinfo -a and then pick one alias for each of those sizes. Then do slabinfo skbuff_head (whatever alias you want to use to refer to the slab) for each of them. Should give some more insight as to how slub behaves with these two slab caches. -- 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/