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=-1.1 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 93ADDC433E1 for ; Wed, 1 Jul 2020 20:32:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73D96208A7 for ; Wed, 1 Jul 2020 20:32:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593635546; bh=Qu1PVZWZQB1pW5uORGG9JkdLLWLwrioSV8gFiogltGY=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=KP3Mt2eEMGn01pfDCNlIQGMkxPGCIE09p00zij30qoFOwtsMNE79ST0mlbkv9t75k 7m1PSup1vFEng6vjFTh8s3f9zk9x4eJJO8Z7YmpblIiXZxyTbT3AGmQV+ju4n8MBJr cFArRIoJVMjzZ4w1ls1fwAExNA8lxC1GRgU/y5aw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726990AbgGAUcX (ORCPT ); Wed, 1 Jul 2020 16:32:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726144AbgGAUcX (ORCPT ); Wed, 1 Jul 2020 16:32:23 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D59D8C08C5DB for ; Wed, 1 Jul 2020 13:32:22 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id b25so25235224ljp.6 for ; Wed, 01 Jul 2020 13:32:22 -0700 (PDT) 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=yQTuuRnTRD5guY+N3kjgnPLHXT6P3qZiYHrrKJ47r1w=; b=M5E2TfLcC3cfW8OMyrKhXxxtIvY0Y104cXmmv3Q4raTCa6ajB/XOROYaclyuBwWh+A QwyVYKRQgeqALuvdcW7sv0dw33dOl/5F5gCyZFcJBfQqk4HuU7lj0CC2aelEfwTDdC0Y 4kjCbqfpjXn7jho9KN1KvD2s7uo+DH0VG6r6M= 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=yQTuuRnTRD5guY+N3kjgnPLHXT6P3qZiYHrrKJ47r1w=; b=e4/Pcw6MAp8Teml7/AQngJZyhFbKjqi4RK5jud7jBd6OWX6U3k2Gn5IlejIvLvXs8w ot5Mx8CUgnXU1gtwE1xsSu349OvAB7O7j4787GlpRoLnkkDGQiSfdgxNUlebXFK8ERC+ sJNj3gRxvKjiIzo+CFCHW4p2iu0Kgp759KdEmMq4IYOZTleUkk2DdgNY8W3OVTA5PSzf F+vXoE9eMykId7uaSZJ39nRAa+5wl1L35jp4Tv3B2XXygPp+9hQ2P1sQ73sahWlYzkSa AE2Bi69YAu23rphRjeAmvSj2pmcL5VSSq6GHYv776gZktqaKUQuJ/FChMBsICaW3DR0+ ua3Q== X-Gm-Message-State: AOAM533BzmupBCIJHNqV+UB/l2bHVKKREwlsjQDJ3MzAbaWsSU0yFVjR ZZFWmROQNwYWig4juFFLH4+p0axqfJM= X-Google-Smtp-Source: ABdhPJxpFsZg6aZ2bRsCmke3Wg/O/+xUzgtA/Zdqd1/ag9muLFkY8r0+a/vS7hJ3xDyUkxYzWiukPA== X-Received: by 2002:a2e:9891:: with SMTP id b17mr10974516ljj.22.1593635540863; Wed, 01 Jul 2020 13:32:20 -0700 (PDT) Received: from mail-lf1-f52.google.com (mail-lf1-f52.google.com. [209.85.167.52]) by smtp.gmail.com with ESMTPSA id y24sm2167521ljy.91.2020.07.01.13.32.19 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Jul 2020 13:32:19 -0700 (PDT) Received: by mail-lf1-f52.google.com with SMTP id t74so14516014lff.2 for ; Wed, 01 Jul 2020 13:32:19 -0700 (PDT) X-Received: by 2002:a19:8a07:: with SMTP id m7mr16119813lfd.31.1593635539128; Wed, 01 Jul 2020 13:32:19 -0700 (PDT) MIME-Version: 1.0 References: <20200624161335.1810359-14-hch@lst.de> <20200701091943.GC3874@shao2-debian> <20200701121344.GA14149@lst.de> In-Reply-To: <20200701121344.GA14149@lst.de> From: Linus Torvalds Date: Wed, 1 Jul 2020 13:32:03 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [fs] 140402bab8: stress-ng.splice.ops_per_sec -100.0% regression To: Christoph Hellwig Cc: kernel test robot , Al Viro , Ian Kent , David Howells , Linux Kernel Mailing List , linux-fsdevel , LSM List , NetFilter , lkp@lists.01.org Content-Type: text/plain; charset="UTF-8" Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org On Wed, Jul 1, 2020 at 5:13 AM Christoph Hellwig wrote: > > FYI, this is because stress-nh tests splice using /dev/null. Which > happens to actually have the iter ops, but doesn't have explicit > splice_read operation. Heh. I guess a splice op for /dev/null should be fairly trivial to implement.. Linus