From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org ADCE4606DD Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752246AbeFFMuZ (ORCPT + 25 others); Wed, 6 Jun 2018 08:50:25 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:53446 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751907AbeFFMuY (ORCPT ); Wed, 6 Jun 2018 08:50:24 -0400 Date: Wed, 6 Jun 2018 14:50:22 +0200 From: Jakub Racek To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , "Rafael J. Wysocki" , Len Brown , ACPI Devel Maling List Subject: Re: Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks Message-ID: <20180606125009.GA29162@jra-laptop.brq.redhat.com> References: <20180606122731.GB27707@jra-laptop.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: X-OS: Linux jra-laptop 3.10.0-862.el7.x86_64 x86_64 User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org +++ Rafael J. Wysocki [06/06/18 14:34 +0200]: >On Wed, Jun 6, 2018 at 2:27 PM, Jakub Racek wrote: >> Hi, >> >> There is a huge performance regression on the 2 and 4 NUMA node systems on >> stream benchmark with 4.17 kernel compared to 4.16 kernel. Stream, Linpack >> and NAS parallel benchmarks show upto 50% performance drop. > >OK, and why do you think that it is related to ACPI? I don't know where the problems is or who to CC. What information should be added? I can probably provide it, if I know what. >Thanks, >Rafael