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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 5A939C43441 for ; Sat, 10 Nov 2018 08:39:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21BC420840 for ; Sat, 10 Nov 2018 08:39:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 21BC420840 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de 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 S1728980AbeKJSXd (ORCPT ); Sat, 10 Nov 2018 13:23:33 -0500 Received: from mx2.suse.de ([195.135.220.15]:44324 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726272AbeKJSXc (ORCPT ); Sat, 10 Nov 2018 13:23:32 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 92B2DADAB; Sat, 10 Nov 2018 08:39:20 +0000 (UTC) Date: Sat, 10 Nov 2018 09:39:18 +0100 From: Jean Delvare To: David Airlie Cc: christian.koenig@amd.com, "Iwai, Takashi" , dri-devel , linux-kernel Subject: Re: Performance regression in ast drm driver Message-ID: <20181110093918.52ec9f0f@endymion> In-Reply-To: References: <20181101162707.598c1718@endymion> <20181108130509.3b2d42ff@endymion> Organization: SUSE Linux X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.31; x86_64-suse-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 9 Nov 2018 10:04:03 +1000, David Airlie wrote: > This seems likely to be a hw problem with PCI writes to the AST "GPU", > since it's just some sort of RAM + ARM on the end of a PCIE bus, we've > definitely seen possible issues in the past with write combining > around some of the mga GPUs with some CPUs. > > Have we seen the problem across a number of AST devices? The reports I received from customers were all on AST 2500 devices (on Supermicro X11DPi-N, Supermicro X11DPH-T and Asus WS C621 Sage). I was able to reproduce "the problem" on my old Asus Z6NA-D6 which has either an AST 2050 device if I trust the board specifications on asus.com, or an AST 1100 if I trust /var/log/Xorg.0.log. Note however that I am still not certain that the problem I am seeing is the same as what both customers reported. It is possible that we have 2 different issues. -- Jean Delvare SUSE L3 Support