From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86087C43603 for ; Tue, 10 Dec 2019 14:15:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61F6E20828 for ; Tue, 10 Dec 2019 14:15:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727545AbfLJOPd (ORCPT ); Tue, 10 Dec 2019 09:15:33 -0500 Received: from mga09.intel.com ([134.134.136.24]:15820 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727061AbfLJOPc (ORCPT ); Tue, 10 Dec 2019 09:15:32 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Dec 2019 06:15:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,299,1571727600"; d="scan'208";a="215453366" Received: from shao2-debian.sh.intel.com (HELO localhost) ([10.239.13.6]) by orsmga006.jf.intel.com with ESMTP; 10 Dec 2019 06:15:31 -0800 Date: Tue, 10 Dec 2019 22:15:02 +0800 From: kernel test robot To: Linus Torvalds Cc: Michal Hocko , David Howells , LKML , lkp@lists.01.org Subject: Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0% regression Message-ID: <20191210141502.GQ32275@shao2-debian> References: <20191208153949.GJ32275@shao2-debian> <20191209085559.GA5868@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 09, 2019 at 10:35:35AM -0800, Linus Torvalds wrote: > On Mon, Dec 9, 2019 at 12:56 AM Michal Hocko wrote: > > > > Huh. How can something like that can even can get merged? No changelog, > > no s-o-b? > > Yeah, I missed that when pulling. > > I wish that had been the only problem we had with that code, but it wasn't. > > Anyway, I'm fairly certain the current git head should fix this > lmbench3 performance regression too. > > Linus Hi Linus, Sorry for the inconvenience, indeed, the regression has been fixed. commit: cefa80ced5 ("pipe: Increase the writer-wakeup threshold to reduce context-switch count") 3c0edea9b2 ("pipe: Remove sync on wake_ups") 6794862a16 ("Merge tag 'for-5.5-rc1-kconfig-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux") cefa80ced57a2917 3c0edea9b29f9be6c093f236f7 6794862a16ef41f753abd75c03 testcase/testparams/testbox ---------------- -------------------------- -------------------------- --------------------------- %stddev change %stddev change %stddev \ | \ | \ 21204 -17% 17604 23% 26123 ± 3% lmbench3/performance-development-100%-PIPE-50%-ucode=0x7000019/lkp-bdw-de1 21204 -17% 17604 23% 26123 GEO-MEAN lmbench3.PIPE.bandwidth.MB/sec Best Regards, Rong Chen