From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751964AbdBCSYK (ORCPT ); Fri, 3 Feb 2017 13:24:10 -0500 Received: from outbound.smtp.vt.edu ([198.82.183.121]:53458 "EHLO omr1.cc.vt.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751208AbdBCSYI (ORCPT ); Fri, 3 Feb 2017 13:24:08 -0500 From: valdis.kletnieks@vt.edu X-Google-Original-From: Valdis.Kletnieks@vt.edu X-Mailer: exmh version 2.8.0 04/21/2012 with nmh-1.6+dev To: Waiman Long Cc: Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Jonathan Corbet , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Arnaldo Carvalho de Melo , Davidlohr Bueso , Mike Galbraith , Scott J Norton Subject: Re: [PATCH-tip v5 17/21] TP-futex: Group readers together in wait queue In-Reply-To: <1486145034-22210-18-git-send-email-longman@redhat.com> References: <1486145034-22210-1-git-send-email-longman@redhat.com> <1486145034-22210-18-git-send-email-longman@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1486146235_2881P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Fri, 03 Feb 2017 13:23:55 -0500 Message-ID: <13281.1486146235@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1486146235_2881P Content-Type: text/plain; charset=us-ascii On Fri, 03 Feb 2017 13:03:50 -0500, Waiman Long said: > On a 2-socket 36-core E5-2699 v3 system (HT off) running on a 4.10 > WW futex TP futex Glibc > -------- -------- ----- > Total locking ops 35,707,234 58,645,434 10,930,422 > Per-thread avg/sec 99,149 162,887 30,362 > Per-thread min/sec 93,190 38,641 29,872 > Per-thread max/sec 104,213 225,983 30,708 Do we understand where the 38K number came from? I'm a bit concerned that the min-to-max has such a large dispersion compared to all the other numbers. Was that a worst-case issue, and is the worst-case something likely to happen in production, or requires special effort to trigger? --==_Exmh_1486146235_2881P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Comment: Exmh version 2.5 07/13/2001 iQEVAwUBWJTKu40DS38y7CIcAQICDQf/WxD/FNbHpiYa9G1eQ2kQVaiFrb93/5Sj sUpmzwuhGPAGqHx6Vup3IUOoAm+1LDQJ7rNkjWjADhmWMRh8ye+M01rIyRC3BIoQ QTMADT7qt/kPjDiC5B8G2Sn7E4WErKSKwPPa85pfctLekt6FNeP6+OZ5K0QLsQYE AEygx4Okz8Hf7Q0GFWul85GVpIAXtNV8yRVPs5P3FuW4ktFTMFdu3fnWwbhnr1Qg Zuw/+Dc38fvbDeazcWPETHS83XHQAosPzLc6+PcMSHzAbpychqVPYjCY0gnPO3bD TIbmVVrbeUJZiXQkPrqKFyHHo7IBrkx96iH0QZEQmOFqGEnzoMtTjQ== =BxPk -----END PGP SIGNATURE----- --==_Exmh_1486146235_2881P--