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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 B8CD9C43331 for ; Thu, 7 Nov 2019 16:52:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F3422077C for ; Thu, 7 Nov 2019 16:52:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573145531; bh=Z1dqk+RRh5Tw9vIdgN632bDR4HOjWiROuyE5KZkrIOc=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=ERBfK5ONRkMOcfDXpcPdNB+6YsoiUYKoTKEctFNqoqgG2BAQ08rL5xO5fqz2zv9tI XPl3nb4zTxJHtWCGUvLIa6EPQ6CiIKnHZKsnkTxt+JCJFHGUxJU6lJEW9GUwegzcD1 p4BSzjzWgaNn9Uae9yHER6syZHfaIciAicZnY//w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729669AbfKGQwL (ORCPT ); Thu, 7 Nov 2019 11:52:11 -0500 Received: from mail-lf1-f67.google.com ([209.85.167.67]:37721 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726810AbfKGQwK (ORCPT ); Thu, 7 Nov 2019 11:52:10 -0500 Received: by mail-lf1-f67.google.com with SMTP id b20so2135563lfp.4 for ; Thu, 07 Nov 2019 08:52:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=QmbLva0bcejWfZ5vroXCCCNjtDh9+KzeuzRfAkUcNVw=; b=RC+2jxnet1c9HEhXNBxtTTpEfLinckdbFJn5Bmrik3m/W7Num2OjpLxTQS23AoRNRr Aj4dYDnclnksK9me7oG5iyDsfchGPA4TwVOyMbOGN2PJFpJroPg+VNW7luk63nWV0aoz X/nFl5ue/aQhw5K+6Ogz8TNi8yWG86H2/HKz4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=QmbLva0bcejWfZ5vroXCCCNjtDh9+KzeuzRfAkUcNVw=; b=TzIO3VlGbcpmHUgRsRvIZIQmIujwUhBzYixMmgKuFxY6nhqpwsa3+9Tbm9P+vabeET uZ4+x2hfk1YA1jEfZbpphTTafsMizr9/FCe7dTxGB2Ekp8ZQjSZz75yWsBeSrkf/+NeI v0qxMWZq27n/zXfzrcZ8Ib36oH7GFcEBLFWGzhdC9TFE+/soCKaKhRD67HoJq+PYYhnO qrZqouJkAvSKzXFBiiKRokHQ8pTvlaGQMBhF4NNwIJsinaupvPedyhZ44z0ZJ9AqY7mq o5u6VuNPrZ9XABsgY1xX6AOrf9zCXuPBPq+AbvznMlfC797o5VCPG+ilEVFKGqM144FP Mm5Q== X-Gm-Message-State: APjAAAUWMiXhHEJRQ/R/t6lb6z89iTLFnwNScomuKu2Tl7EeKQonRP04 Z9Dt43wkJkGaP2iyPt/1s4jXl0+JNKI= X-Google-Smtp-Source: APXvYqxFqyqvYhClw3KNBxy7jpM0c+SP8hCNg+PU54s3t0pTDmxI5uSzdEZ6PZudWyC+RD/nESPKeA== X-Received: by 2002:a19:6917:: with SMTP id e23mr3102914lfc.4.1573145528502; Thu, 07 Nov 2019 08:52:08 -0800 (PST) Received: from mail-lf1-f47.google.com (mail-lf1-f47.google.com. [209.85.167.47]) by smtp.gmail.com with ESMTPSA id 4sm1238992lfa.95.2019.11.07.08.52.06 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Nov 2019 08:52:07 -0800 (PST) Received: by mail-lf1-f47.google.com with SMTP id j5so2113517lfh.10 for ; Thu, 07 Nov 2019 08:52:06 -0800 (PST) X-Received: by 2002:ac2:5bca:: with SMTP id u10mr3159115lfn.134.1573145526683; Thu, 07 Nov 2019 08:52:06 -0800 (PST) MIME-Version: 1.0 References: <157262967752.13142.696874122947836210.stgit@warthog.procyon.org.uk> <20191107090306.GV29418@shao2-debian> In-Reply-To: <20191107090306.GV29418@shao2-debian> From: Linus Torvalds Date: Thu, 7 Nov 2019 08:51:50 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement To: lkp report check Cc: David Howells , Rasmus Villemoes , Greg Kroah-Hartman , Peter Zijlstra , Nicolas Dichtel , raven@themaw.net, Christian Brauner , keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-block , LSM List , linux-fsdevel , Linux API , Linux Kernel Mailing List , lkp@lists.01.org Content-Type: text/plain; charset="UTF-8" Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Nov 7, 2019 at 1:03 AM lkp report check wrote: > > FYI, we noticed a 144.0% improvement of phoronix-test-suite.noise-level.0.activity_level due to commit: > > commit: d60337eff18a3c587832ab8053a567f1da9710d2 ("[RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length [ver #3]") That sounds nice, but is odd. That commit really shouldn't change anything noticeable. David, any idea? Linus