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_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 31170C43142 for ; Fri, 22 Jun 2018 07:20:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E504B208F7 for ; Fri, 22 Jun 2018 07:20:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E504B208F7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=atomide.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751342AbeFVHUK (ORCPT ); Fri, 22 Jun 2018 03:20:10 -0400 Received: from muru.com ([72.249.23.125]:48668 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750983AbeFVHUI (ORCPT ); Fri, 22 Jun 2018 03:20:08 -0400 Received: from atomide.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTPS id 2E58C80C5; Fri, 22 Jun 2018 07:22:53 +0000 (UTC) Date: Fri, 22 Jun 2018 00:20:05 -0700 From: Tony Lindgren To: Pavel Machek Cc: kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, sre@kernel.org, nekit1000@gmail.com, mpartap@gmx.net, merlijn@wizzup.org Subject: Re: v4.18-rc1 on droid 4: very bad CPU performance Message-ID: <20180622072005.GF112168@atomide.com> References: <20180621121542.GA4836@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180621121542.GA4836@amd> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Pavel Machek [180621 12:18]: > Hi! > > V4.18 is slower than it should be. > > user@devuan:~$ time cat /dev/urandom | head -c 10000000 | bzip2 -9 - > | wc -c > 10044291 > 52.73user 2.40system 61.53 (1m1.534s) elapsed 89.60%CPU > user@devuan:~$ uname -a > Linux devuan 4.18.0-rc1-87964-gfa19934-dirty #743 SMP Sun Jun 17 > 19:26:37 CEST 2018 armv7l GNU/Linux > > That bzip should take 12 seconds, not minute. > > Any ideas? Do you see it, too? I've noticed firefox is super slow.. Git bisect time? Regards, Tony From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Fri, 22 Jun 2018 00:20:05 -0700 Subject: v4.18-rc1 on droid 4: very bad CPU performance In-Reply-To: <20180621121542.GA4836@amd> References: <20180621121542.GA4836@amd> Message-ID: <20180622072005.GF112168@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Pavel Machek [180621 12:18]: > Hi! > > V4.18 is slower than it should be. > > user at devuan:~$ time cat /dev/urandom | head -c 10000000 | bzip2 -9 - > | wc -c > 10044291 > 52.73user 2.40system 61.53 (1m1.534s) elapsed 89.60%CPU > user at devuan:~$ uname -a > Linux devuan 4.18.0-rc1-87964-gfa19934-dirty #743 SMP Sun Jun 17 > 19:26:37 CEST 2018 armv7l GNU/Linux > > That bzip should take 12 seconds, not minute. > > Any ideas? Do you see it, too? I've noticed firefox is super slow.. Git bisect time? Regards, Tony