Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753933AbYJJFke (ORCPT ); Fri, 10 Oct 2008 01:40:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752169AbYJJFkX (ORCPT ); Fri, 10 Oct 2008 01:40:23 -0400 Received: from casper.infradead.org ([85.118.1.10]:38211 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752495AbYJJFkW (ORCPT ); Fri, 10 Oct 2008 01:40:22 -0400 Subject: Re: [tbench regression fixes]: digging out smelly deadmen. From: Peter Zijlstra To: Evgeniy Polyakov Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , David Miller In-Reply-To: <20081009231759.GA8664@tservice.net.ru> References: <20081009231759.GA8664@tservice.net.ru> Content-Type: text/plain Date: Fri, 10 Oct 2008 07:40:05 +0200 Message-Id: <1223617206.7382.54.camel@lappy.programming.kicks-ass.net> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 947 Lines: 27 On Fri, 2008-10-10 at 03:17 +0400, Evgeniy Polyakov wrote: > I was so lucky to 'guess' (just after couple of hundreds of compilations), > that it corresponds to 8f4d37ec073c17e2d4aa8851df5837d798606d6f commit about > high-resolution timers, attached patch against 2.6.25 brings tbench > performance for the 2.6.25 kernel tree to 455 MB/s. can you try echo NO_HRTICK > /debug/sched_features on .27 like kernels? Also, what clocksource do those machines use? cat /sys/devices/system/clocksource/clocksource0/current_clocksource As to, a7be37ac8e1565e00880531f4e2aff421a21c803, could you try tip/master? I reworked some of the wakeup preemption code in there. Thanks for looking into this issue! -- 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/