Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754124AbZIGRip (ORCPT ); Mon, 7 Sep 2009 13:38:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754105AbZIGRip (ORCPT ); Mon, 7 Sep 2009 13:38:45 -0400 Received: from brick.kernel.dk ([93.163.65.50]:52915 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753545AbZIGRio (ORCPT ); Mon, 7 Sep 2009 13:38:44 -0400 Date: Mon, 7 Sep 2009 19:38:46 +0200 From: Jens Axboe To: Ingo Molnar Cc: Con Kolivas , linux-kernel@vger.kernel.org, Peter Zijlstra , Mike Galbraith Subject: Re: BFS vs. mainline scheduler benchmarks and measurements Message-ID: <20090907173846.GB18599@kernel.dk> References: <20090906205952.GA6516@elte.hu> <20090907094953.GP18599@kernel.dk> <20090907115750.GW18599@kernel.dk> <20090907141458.GD24507@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090907141458.GD24507@elte.hu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1531 Lines: 43 On Mon, Sep 07 2009, Ingo Molnar wrote: > > * Jens Axboe wrote: > > > On Mon, Sep 07 2009, Jens Axboe wrote: > > > Scheduler Runtime Max lat Avg lat Std dev > > > ---------------------------------------------------------------- > > > CFS 100 951 462 267 > > > CFS-x2 100 983 484 308 > > > BFS > > > BFS-x2 > > > > Those numbers are buggy, btw, it's not nearly as bad. But > > responsiveness under compile load IS bad though, the test app just > > didn't quantify it correctly. I'll see if I can get it working > > properly. > > What's the default latency target on your box: > > cat /proc/sys/kernel/sched_latency_ns > > ? It's off right now, but it is set to whatever is the default. I don't touch it. > And yes, it would be wonderful to get a test-app from you that would > express the kind of pain you are seeing during compile jobs. I was hoping this one would, but it's not showing anything. I even added support for doing the ping and wakeup over a socket, to see if the pipe test was doing well because of the sync wakeup we do there. The net latency is a little worse, but still good. So no luck in making that app so far. -- Jens Axboe -- 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/