Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752060AbZIHRzc (ORCPT ); Tue, 8 Sep 2009 13:55:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751979AbZIHRzb (ORCPT ); Tue, 8 Sep 2009 13:55:31 -0400 Received: from mail-yw0-f173.google.com ([209.85.211.173]:42160 "EHLO mail-yw0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752058AbZIHRzb convert rfc822-to-8bit (ORCPT ); Tue, 8 Sep 2009 13:55:31 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=e6jpYIGaoWae0MVtnV3js7RCzarMl0dStIm6Zg2ooCBAFNp8TCB8VKLUyw7YqKJKH3 opw1+BZaxLTNMrzGgK8YV+kFWYBJdIibX7ZHjv/K0XIIoVZBOOSKyTvYrIvnJwnw8cqn SiAmPkxHuLVJDTomjpNQz8OQOEUdx7a7sicOI= MIME-Version: 1.0 In-Reply-To: <87hbvdiogq.fsf@depni.sinp.msu.ru> References: <20090906205952.GA6516@elte.hu> <87hbvdiogq.fsf@depni.sinp.msu.ru> Date: Tue, 8 Sep 2009 10:47:25 -0700 Message-ID: <4807377b0909081047kfad088j694bd2b806075c5f@mail.gmail.com> Subject: Re: Epic regression in throughput since v2.6.23 From: Jesse Brandeburg To: Serge Belyshev Cc: Ingo Molnar , Con Kolivas , linux-kernel@vger.kernel.org, Peter Zijlstra , Mike Galbraith Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1023 Lines: 21 On Tue, Sep 8, 2009 at 5:57 AM, Serge Belyshev wrote: > > Hi. I've done measurments of time taken by make -j4 kernel build > on a quadcore box. ?Results are interesting: mainline kernel > has regressed since v2.6.23 release by more than 10%. Is this related to why I now have to double the amount of threads X I pass to make -jX, in order to use all my idle time for a kernel compile? I had noticed (without measuring exactly) that it seems with each kernel released in this series mentioned, I had to increase my number of worker threads, my common working model now is (cpus * 2) in order to get zero idle time. Sorry I haven't tested BFS yet, but am interested to see if it helps interactivity when playing flash videos on my dual core laptop. -- 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/