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SubjectRE: Performance regression in ast drm driver
We found the performance will be bad on desktop environment with OpenSUSE15 UEFI installation if remove "arch_io_reserve_memtype_wc".


Y.C. Chen

-----Original Message-----
From: dri-devel [] On Behalf Of Jean Delvare
Sent: Thursday, November 08, 2018 8:05 PM
To: Dave Airlie <>
Cc: Christian König <>;;
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?

Jean Delvare
SUSE L3 Support
dri-devel mailing list
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