[PATCH 0/3] drm/amdgpu: Tweaks for high pressure on CPU visible VRAM

[John Brooks]

On Mon, May 22, 2017 at 12:09:21PM +0200, Marek Olšák wrote:
> On Mon, May 22, 2017 at 12:00 PM, Michel Dänzer <michel at daenzer.net> wrote:
> > On 20/05/17 06:26 PM, Marek Olšák wrote:
> >> On May 20, 2017 3:26 AM, "Michel Dänzer" <michel at daenzer.net
> >> <mailto:michel at daenzer.net>> wrote:
> >>
> >>     On 20/05/17 01:14 AM, Marek Olšák wrote:
> >>     > Hi Michel,
> >>     >
> >>     > I've applied your series
> >>
> >>     Thanks for testing it.
> >>
> >>     > and it doesn't help with low Dirt Rally performance on Fiji. I see TTM
> >>     > buffer moves at 800MB/s and many VRAM page faults.
> >>
> >>     Did you see this:
> >>
> >>     >> Note that there's only little if any improvement of the average
> >>     framerate
> >>     >> reported, but the minimum framerate as seen on the HUD goes from
> >>     ~10 fps
> >>     >> to ~17.
> >>
> >>     I.e. it mostly affects the minimum framerate and smoothness for me
> >>     as well.
> >>
> >>
> >> Without the series, I get 70 average fps. With the series, I get 30
> >> average fps. That might just be random bad luck. I don't know.
> >
> > Hmm, yeah, maybe that was just one of the random slowdowns you've been
> > talking about in other threads and on IRC?
> >
> > I can't reproduce any slowdown with these patches, even leaving visible
> > VRAM size at 256 MB.
> 
> The random slowdowns with Dirt Rally are only caused by the pressure
> on visible VRAM. This whole thread is about those random slowdowns. If
> you're saying "maybe it was just one of the random slowdowns", you're
> saying "maybe it was just the visible VRAM pressure". It's only
> random with Dirt Rally, which makes it difficult to believe statements
> such as "I can't reproduce any slowdown". It's not random with Dying
> Light.
> 
> Marek

For what it's worth, the best place to reproduce it in Dying Light is the
courtyard where Zere's trailer is. It's the first place you go after leaving
the Tower for the first time at the start of the game. The Tower lobby is
another good place. Outside of these areas the slowdown may not be apparent at
all.

John

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