Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935586AbaDJOSg (ORCPT ); Thu, 10 Apr 2014 10:18:36 -0400 Received: from mail-ee0-f52.google.com ([74.125.83.52]:44770 "EHLO mail-ee0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934295AbaDJOSe (ORCPT ); Thu, 10 Apr 2014 10:18:34 -0400 Message-ID: <1397139510.5137.92.camel@marge.simpson.net> Subject: Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems From: Mike Galbraith To: Steven Rostedt Cc: LKML , linux-rt-users , "Paul E. McKenney" , Paul Gortmaker , Thomas Gleixner , Sebastian Andrzej Siewior , Clark Williams , Frederic Weisbecker , Peter Zijlstra , Ingo Molnar Date: Thu, 10 Apr 2014 16:18:30 +0200 In-Reply-To: <20140409151922.5fa5d999@gandalf.local.home> References: <20140409151922.5fa5d999@gandalf.local.home> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2014-04-09 at 15:19 -0400, Steven Rostedt wrote: > If you have any benchmark on large machines I would be very happy if > you could test this patch against the unpatched version of -rt. Too bad I don't have (and know how to use) specjbb. I dug up old vmark, thinking I'd be able to get some halfway useful relative numbers from it, but that was a waste of a day. The thing performs so badly on 40 core box that rt _beats_ nopreempt, and after 2 nodes, you're going backward. 40 Westmere EX cores does a whopping ~2.5 * dinky old Q6600 box throughput. -Mike -- 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/