From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean Delvare Subject: Re: Performance regression in ast drm driver Date: Thu, 8 Nov 2018 13:05:09 +0100 Message-ID: <20181108130509.3b2d42ff@endymion> References: <20181101162707.598c1718@endymion> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20181101162707.598c1718@endymion> Sender: linux-kernel-owner@vger.kernel.org To: Dave Airlie Cc: Christian =?UTF-8?B?S8O2bmln?= , Takashi Iwai , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org List-Id: dri-devel@lists.freedesktop.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