From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755047AbYCYN0Q (ORCPT ); Tue, 25 Mar 2008 09:26:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754185AbYCYN0B (ORCPT ); Tue, 25 Mar 2008 09:26:01 -0400 Received: from fg-out-1718.google.com ([72.14.220.153]:51623 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754073AbYCYN0A (ORCPT ); Tue, 25 Mar 2008 09:26:00 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qmFlgxAy9ktWSpp+DRMMxus/LDCibOOttHe877FS0FxutEbSb1oW6Z5mwjwy9AdwyJm6TrQNLqzmGFx/pPveURxhjJlWVq37KGCp8q9+VqZObEKY4MOV3470U8rYvgZ2v9AMz7d0EkEYzO6heehtDtKy+v7YsCjxY4EJLIf9o/M= Message-ID: Date: Tue, 25 Mar 2008 14:25:59 +0100 From: "Bart Van Assche" To: "Sanders, Rob M." Subject: Re: Performance changes between 2.6.13 and 2.6.23 Cc: linux-kernel@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 25, 2008 at 1:34 PM, Sanders, Rob M. wrote: > Of more particular concern, the main application that I build has seen a 4-5X > slowdown in performance. Is this a singlethreaded or a multithreaded application ? Is this application CPU-bound or IO-bound ? Does it rely a lot on memory allocation ? I'm not sure this will tell you the cause, but what might help is to compile and run lmbench2 and interbench, and to compare the results for the two kernel versions. Make sure that only the kernel version differs between the two test runs, and that all other components (a.o. libc and libpthread) stay the same. Booting the old YDL with the new kernel should work, while booting the new YDL with an old kernel probably will cause trouble. See also http://www.bitmover.com/lmbench/ and http://members.optusnet.com.au/ckolivas/interbench/. Bart.