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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 E8E48C43141 for ; Thu, 21 Jun 2018 12:15:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFE19208A3 for ; Thu, 21 Jun 2018 12:15:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AFE19208A3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ucw.cz 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 S933487AbeFUMPr (ORCPT ); Thu, 21 Jun 2018 08:15:47 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:54914 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933066AbeFUMPp (ORCPT ); Thu, 21 Jun 2018 08:15:45 -0400 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 683688058B; Thu, 21 Jun 2018 14:15:43 +0200 (CEST) Date: Thu, 21 Jun 2018 14:15:42 +0200 From: Pavel Machek To: kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, tony@atomide.com, sre@kernel.org, nekit1000@gmail.com, mpartap@gmx.net, merlijn@wizzup.org Subject: v4.18-rc1 on droid 4: very bad CPU performance Message-ID: <20180621121542.GA4836@amd> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="liOOAslEiF7prFVr" Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --liOOAslEiF7prFVr Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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? Best regards, Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --liOOAslEiF7prFVr Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlsrlu4ACgkQMOfwapXb+vI+ZgCgjGoE/b39+ozezf6HIClfCRPR XMEAoIORuNoXvcljvgv1WlK55Qe1+Oz7 =51ml -----END PGP SIGNATURE----- --liOOAslEiF7prFVr--