From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760959AbYEHJhr (ORCPT ); Thu, 8 May 2008 05:37:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754049AbYEHJhj (ORCPT ); Thu, 8 May 2008 05:37:39 -0400 Received: from mail.gmx.net ([213.165.64.20]:54974 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752032AbYEHJhi (ORCPT ); Thu, 8 May 2008 05:37:38 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX189Ri05P2M9xh/lwGyrq9AzAjsz3ZzX4VyL5oVRyq OwyT2Hze0/1QYB Subject: Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1 From: Mike Galbraith To: Ingo Molnar Cc: "Zhang, Yanmin" , Peter Zijlstra , LKML In-Reply-To: <20080508084607.GA31515@elte.hu> References: <1210136148.3453.59.camel@ymzhang> <1210177575.6525.4.camel@lappy.programming.kicks-ass.net> <1210228531.3453.124.camel@ymzhang> <1210233617.4895.6.camel@marge.simson.net> <20080508084607.GA31515@elte.hu> Content-Type: text/plain Date: Thu, 08 May 2008 11:37:34 +0200 Message-Id: <1210239454.7036.2.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2008-05-08 at 10:46 +0200, Ingo Molnar wrote: > Could you perhaps try the hack below that uses /proc/sys/kernel/panic as > a flag whether the BKL should cause us to block or should be spun upon. > > Can you confirm that with that patch too sysbench shows sensitivity to > the value of the panic flag? [this is the surest way to measure such > effects as flipping the sysctl only minimally impacts the system.] Difference for average of 3 runs at 128 clients is 0.3% with this patch.. iow, nope. -Mike