Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933871AbaDKN0A (ORCPT ); Fri, 11 Apr 2014 09:26:00 -0400 Received: from toro.web-alm.net ([62.245.132.31]:60953 "EHLO toro.web-alm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932959AbaDKNZ6 (ORCPT ); Fri, 11 Apr 2014 09:25:58 -0400 X-Greylist: delayed 1971 seconds by postgrey-1.27 at vger.kernel.org; Fri, 11 Apr 2014 09:25:58 EDT Message-ID: <5347E475.4020009@osadl.org> Date: Fri, 11 Apr 2014 14:47:49 +0200 From: Carsten Emde Organization: Open Source Automation Development Lab (OSADL) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Steven Rostedt , LKML , linux-rt-users CC: Mike Galbraith , "Paul E. McKenney" , Paul Gortmaker , Thomas Gleixner , Sebastian Andrzej Siewior , Clark Williams , Frederic Weisbecker , Peter Zijlstra , Ingo Molnar Subject: Re: [RFC PATCH RT V3] rwsem: The return of multi-reader PI rwsems References: <20140409151922.5fa5d999@gandalf.local.home> <20140410134217.38cd6db7@gandalf.local.home> <20140410223508.6d0fc135@gandalf.local.home> In-Reply-To: <20140410223508.6d0fc135@gandalf.local.home> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Steven, > [..] I added Carsten to the Cc, so I'll post the entire change log > of v1 here again. I've been listening and testing boxes all the time ... > [..] 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. Three machines - an X32 x86_64 (AMD Opteron 6272 @2100 MHz) at rack #1/slot #1, - an X4x2 x86_64 (Intel i7-2600K @3400 MHz) at rack #4/slot #6, and - an X4 ARM (i.MX6 Quad @996 MHz) at rack #8/slot #7 are running a v3-patched 3.12.15-rt25 kernel now. I'll equip more machines later. What I can say so far is: - No evidence for any regression, no crashes - Performance certainly at least as good as unpatched, probably better I'll do more tests and come back with more precise performance comparison data. Thanks, -Carsten. -- 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/