linux-kernel - RE: Performance regression in ast drm driver

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Message-ID: <985f3dff65744a1899cb012cbb3d4156@TWMBX01.aspeed.com>
Date:   Tue, 13 Nov 2018 08:19:46 +0000
From:   YC Chen <yc_chen@...eedtech.com>
To:     Jean Delvare <jdelvare@...e.de>, Dave Airlie <airlied@...hat.com>
CC:     Christian König <christian.koenig@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        YC Chen <yc_chen@...eedtech.com>
Subject: RE: Performance regression in ast drm driver

Sir,
We found the performance will be bad on desktop environment with OpenSUSE15 UEFI installation if remove "arch_io_reserve_memtype_wc".

Regards,

Y.C. Chen

-----Original Message-----
From: dri-devel [mailto:dri-devel-bounces@...ts.freedesktop.org] On Behalf Of Jean Delvare
Sent: Thursday, November 08, 2018 8:05 PM
To: Dave Airlie <airlied@...hat.com>
Cc: Christian König <christian.koenig@....com>; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org
Subject: Re: Performance regression in ast drm driver

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
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