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 93C9AC46465 for ; Thu, 8 Nov 2018 12:05:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 654E420892 for ; Thu, 8 Nov 2018 12:05:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 654E420892 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 S1726915AbeKHVkW (ORCPT ); Thu, 8 Nov 2018 16:40:22 -0500 Received: from mx2.suse.de ([195.135.220.15]:51722 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726252AbeKHVkW (ORCPT ); Thu, 8 Nov 2018 16:40:22 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id E07A5AF4C; Thu, 8 Nov 2018 12:05:10 +0000 (UTC) Date: Thu, 8 Nov 2018 13:05:09 +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: Re: Performance regression in ast drm driver Message-ID: <20181108130509.3b2d42ff@endymion> In-Reply-To: <20181101162707.598c1718@endymion> References: <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 On Thu, 1 Nov 2018 16:27:07 +0100, Jean Delvare wrote: > 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? And in the meantime, what bad will happen if we just revert the ast portion of that commit? Thanks, -- Jean Delvare SUSE L3 Support