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,URIBL_BLOCKED, 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 5D40CC76191 for ; Mon, 22 Jul 2019 01:35:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 37510218BE for ; Mon, 22 Jul 2019 01:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728569AbfGVB1m (ORCPT ); Sun, 21 Jul 2019 21:27:42 -0400 Received: from mga12.intel.com ([192.55.52.136]:1716 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726571AbfGVB1m (ORCPT ); Sun, 21 Jul 2019 21:27:42 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Jul 2019 18:27:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,292,1559545200"; d="scan'208";a="320541601" Received: from shbuild999.sh.intel.com (HELO localhost) ([10.239.147.113]) by orsmga004.jf.intel.com with ESMTP; 21 Jul 2019 18:27:39 -0700 Date: Mon, 22 Jul 2019 09:27:50 +0800 From: Feng Tang To: Linus Walleij Cc: "Chen, Rong A" , Bartosz Golaszewski , Shravan Kumar Ramani , LKP , David Woods , Linus Torvalds , LKML Subject: Re: [LKP] [gpio] f69e00bd21: unixbench.score -24.2% regression Message-ID: <20190722012750.GB50506@shbuild999.sh.intel.com> References: <20190710121518.GR17490@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Linus, On Wed, Jul 17, 2019 at 05:42:15AM +0800, Linus Walleij wrote: > On Wed, Jul 10, 2019 at 2:15 PM kernel test robot wrote: > > > FYI, we noticed a -24.2% regression of unixbench.score due to commit: > > commit: f69e00bd21aa6a1961c521b6eb199137fcb8a76a ("gpio: mmio: Support two direction registers") > > https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master > > That's pretty bogus since the test doesn't even seem to be using GPIO. > Further AFAIK Intel chips don't even use that driver. > > Can you provide some rootcausing? We did some further check, and found this is a false alarm. That some recent change to LKP itself has enabled the latencytop for newer kernel(post 5.1-rc1), and latencytop is known to bring extra system load to scheduling related benchmarks like unixbench, which caused this -24.7 difference of unixbench score. Sorry for the noise. Thanks, Feng > If you are using GPIOs from userspace in the test somehow I am > sure both me and Bartosz would be interested to hear how. > > Yours, > Linus Walleij > _______________________________________________ > LKP mailing list > LKP@lists.01.org > https://lists.01.org/mailman/listinfo/lkp