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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 AEB5CC43603 for ; Wed, 11 Dec 2019 14:52:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 847FC214AF for ; Wed, 11 Dec 2019 14:52:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729652AbfLKOwX (ORCPT ); Wed, 11 Dec 2019 09:52:23 -0500 Received: from mga09.intel.com ([134.134.136.24]:46002 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726242AbfLKOwW (ORCPT ); Wed, 11 Dec 2019 09:52:22 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Dec 2019 06:52:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,301,1571727600"; d="scan'208";a="203587539" Received: from rongch2-mobl.ccr.corp.intel.com (HELO [10.255.29.204]) ([10.255.29.204]) by orsmga007.jf.intel.com with ESMTP; 11 Dec 2019 06:52:20 -0800 Subject: Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0% regression To: Linus Torvalds Cc: Michal Hocko , David Howells , LKML , lkp@lists.01.org References: <20191208153949.GJ32275@shao2-debian> <20191209085559.GA5868@dhcp22.suse.cz> <20191210141502.GQ32275@shao2-debian> From: kernel test robot Message-ID: Date: Wed, 11 Dec 2019 22:52:19 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/11/2019 1:52 AM, Linus Torvalds wrote: > On Tue, Dec 10, 2019 at 6:15 AM kernel test robot wrote: >> Hi Linus, >> >> Sorry for the inconvenience, indeed, the regression has been fixed. > Woohoo.. And more than fixed, it looks like. Not that I looked at > historical data, I'm not sure how much this number normally > fluctuates. I'm assuming the stddev is just a per-boot "do it a few > times" rather than any long-term thing? > > Linus Hi Linus, Yes, the stddev is not very precise, we usually boot more than three times to get the value. Best Regards, Rong Chen