Received: by 2002:ac0:98c7:0:0:0:0:0 with SMTP id g7-v6csp981370imd; Thu, 1 Nov 2018 08:29:08 -0700 (PDT) X-Google-Smtp-Source: AJdET5fhOfUqiJvbJvSk0F6AJYFOhXd0X5UJ47oXF14ZE/vtFojFkJfBbQyYdBLwsQqLRMHrSIdH X-Received: by 2002:a63:2507:: with SMTP id l7mr7277099pgl.22.1541086148341; Thu, 01 Nov 2018 08:29:08 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1541086148; cv=none; d=google.com; s=arc-20160816; b=HcdlhsnyQZZ6euSpJepNp2gzNroaIFg4u32F8K+2nJcD7+Ej+Ym3a2W44yLiJMaWN8 kTIIujQqW7aOOVRyvdLvkaZo1RCzCOJuVbFn+UMR3AlYejdqEReM/xIeyvVktoZm+qmF EzsWUAWEvgLnyIarGSl4PxlK92DY9fXUkBqhM4QTc+DfD+y1luFrf/WU13Cjd/Y/fPre 4Im6OlSfL8diCjTvn6Ui/3h7/oAxSeC90fd8Emr77+xCG/zwB4zMvEbZBr8+OAj9sXgA sF6PExOJxROEnvVIqcE5U/qACku2L4TfVoc7NS738vf/m5/nm/o2qt/z/p6gdOMlGs/D KEXA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :organization:message-id:subject:cc:to:from:date; bh=QVX444dlc7xOnQYsdellTmyNUpv2c3q9GJcBNtCsR30=; b=PmgEtX+cM7amrgNx6WIr23j9vvrSUoQkMs+b/3gN2OvoW3BcNtQhTDRSFfUMIZ91W/ fLT7D6iCEpgUBzsyeBSYksQoYLBxHrnE64z7so4/DyV0tnS8I7aFJ+7iSqQ26nWF+1nm vj6k9/cJ5bLd+AlMwkKxjNJ8iNCjIJoiAUzHxIwip2MEmFPxVxvJlz/t5hpflyVeaRXV +dJo7L2+DO5gI5E9k0vElM97btaV7EZbC7ucwCcbAG3zJ+r3R+yq13ygZtTdxFFly066 XMpSHKW7vdhG49mRY2EZJRdRTg1zp2irh4RD5Sa8IlDA/ctsJJX2qmlQoCb1WPkNZjgz 0wnQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f10-v6si30572070plo.109.2018.11.01.08.28.52; Thu, 01 Nov 2018 08:29:08 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728583AbeKBAaf (ORCPT + 99 others); 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