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=-7.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A1B14C43603 for ; Mon, 9 Dec 2019 08:56:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 640D720692 for ; Mon, 9 Dec 2019 08:56:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575881763; bh=lyCPhG+AcwqTTAuM0gsQ0MpixFG7NFJVOaTvOq94Vnc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=JUMbISS3oehHbsLmo1paLcPHs2LxjmIi/80lqj22f/QFwyrkms3KsUpdhzRhvciy1 reaZ5lIxX0BgoNoLqOD9XUxFp7hh/gTIMA5yxLHj7MezdFpUA/nJij7+bPKKgmrpFN pWJ9hXRnBACEJ0SaVjWsE2vaSfVCZhyZPQrtW1TU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727269AbfLII4C (ORCPT ); Mon, 9 Dec 2019 03:56:02 -0500 Received: from mail-wm1-f66.google.com ([209.85.128.66]:40569 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726377AbfLII4C (ORCPT ); Mon, 9 Dec 2019 03:56:02 -0500 Received: by mail-wm1-f66.google.com with SMTP id t14so13941709wmi.5 for ; Mon, 09 Dec 2019 00:56:01 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=+jNs0/gfWc0O18Xh8VftNsf/QHjT78loeH1CleZ5apQ=; b=pRkgVlld4RpsLZhMXn+Stf+sKQddTBZbNnDPk62zOvKGmPwUrmusOxoAp0us7YJXou ys+A3qkN3UOG8+Vkg+5gvBRWfVjmA0LdGAiAiLD9h2Us1HXp0wmOeHGKMtUp/uloYTAg j7ai0IF/7T5g84Pi+9rhE1kdqG/7aQyUnJaTyLhMz9eONuFxjUd017zn1qamKDrSDJOB 3osWQXmE3lo71ozoxwMEGxc2Pdlb2MiZD3fEtuQqSmztQV1SAR1nvJZKE0uriUGv6clK 2fb8o9mC/gedn8Wqc2qlFOpm+Rit19CnDE2ijWhZXtzma0OA9baDv2/SkTLIjQGDIUv7 StGg== X-Gm-Message-State: APjAAAU+7pJR4yiHaGFwZzuVq8Q/GDDxnfKTvpA+Phadu+Ig2N3VeCMK YMOVLbF7cJWNbstsXdeaeVs= X-Google-Smtp-Source: APXvYqxo+DeuQmn77r793oTfIMPyj1gOkRciRJ2kiEAoJSe20gejEmrTaA5i0JLrOD95ryH6oX0EnQ== X-Received: by 2002:a1c:67c3:: with SMTP id b186mr15043958wmc.36.1575881760547; Mon, 09 Dec 2019 00:56:00 -0800 (PST) Received: from localhost (prg-ext-pat.suse.com. [213.151.95.130]) by smtp.gmail.com with ESMTPSA id a184sm13283420wmf.29.2019.12.09.00.55.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2019 00:55:59 -0800 (PST) Date: Mon, 9 Dec 2019 09:55:59 +0100 From: Michal Hocko To: kernel test robot Cc: David Howells , LKML , Linus Torvalds , lkp@lists.01.org Subject: Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0% regression Message-ID: <20191209085559.GA5868@dhcp22.suse.cz> References: <20191208153949.GJ32275@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191208153949.GJ32275@shao2-debian> 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 Sun 08-12-19 23:39:49, kernel test robot wrote: > Greeting, > > FYI, we noticed a -17.0% regression of lmbench3.PIPE.bandwidth.MB/sec due to commit: > > > commit: 3c0edea9b29f9be6c093f236f762202b30ac9431 ("pipe: Remove sync on wake_ups") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master Huh. How can something like that can even can get merged? No changelog, no s-o-b? -- Michal Hocko SUSE Labs