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

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Date:   Tue, 13 Nov 2018 13:08:21 +0100
From:   Jean Delvare <jdelvare@...e.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Takashi Iwai <tiwai@...e.de>, David Airlie <airlied@...hat.com>,
        christian.koenig@....com,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance regression in ast drm driver

Hi Thomas,

On Tue, 13 Nov 2018 10:23:45 +0100, Thomas Zimmermann wrote:
> ast doesn't remove the vesafb's framebuffer before attaching to the
> device. I have a patch at [1]. If you have a way of testing it, I'd
> appreciate.
> 
> [1] https://bugzilla.suse.com/show_bug.cgi?id=1112963

Thank you very much for looking into this bug. I tested the patch above
and yes, it solves my console performance problem. The performance with
your patch applied is roughly the same as with commit "drm/drivers: add
support for using the arch wc mapping API" reverted.

-- 
Jean Delvare
SUSE L3 Support