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 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 58002C0044C for ; Thu, 1 Nov 2018 15:27:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 16ADB2081B for ; Thu, 1 Nov 2018 15:27:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16ADB2081B 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 S1728614AbeKBAaf (ORCPT ); Thu, 1 Nov 2018 20:30:35 -0400 Received: from mx2.suse.de ([195.135.220.15]:46448 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727966AbeKBAaf (ORCPT ); Thu, 1 Nov 2018 20:30:35 -0400 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 1BE32AC90; Thu, 1 Nov 2018 15:27:09 +0000 (UTC) Date: Thu, 1 Nov 2018 16:27:07 +0100 From: Jean Delvare To: Dave Airlie Cc: Christian =?UTF-8?B?S8O2bmln?= , Takashi Iwai , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Performance regression in ast drm driver Message-ID: <20181101162707.598c1718@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 Hi David, The following commit: commit 7cf321d118a825c1541b43ca45294126fd474efa Author: Dave Airlie Date: Mon Oct 24 15:37:48 2016 +1000 drm/drivers: add support for using the arch wc mapping API. is causing a huge performance regression for the ast drm driver. In a text console, if I call "cat" on a large text file, it takes almost twice as much time to be displayed and scrolled completely. Can you please check that the ast driver portion of that commit is both correct and complete? Thanks, -- Jean Delvare SUSE L3 Support