[Bug 98693] Mad Max: Long lags when VRAM full

[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

            Bug ID: 98693
           Summary: Mad Max: Long lags when VRAM full
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jani.karkkainen@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

I get random lagging when playing the recently released Mad Max. Every once in
a while, the game freezes completely, and gets back to the game after an
arbitrary amount of seconds, anywhere from 2 to 35. 

With GALLIUM_HUD, and noticed that the lags appear to precede the VRAM slowly
ramping up to full, and then I get this huge lag, and then VRAM usage is a lot
lower (eg. from 1GB to ~600MB).

I found this possibly related news item from a couple of months back:
https://www.gamingonlinux.com/articles/a-reason-for-poor-performance-on-amd-plus-mesa-has-been-found-and-a-patch-is-in-progress.7873

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach a screenshot taken withing a minute after a freeze with
GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-compilations+num-shaders-created
.

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

--- Comment #2 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
Created attachment 128034
  --> https://bugs.freedesktop.org/attachment.cgi?id=128034&action=edit
GALLIUM_HUD enabled with requested settings

GALLIUM_HUD enabled with requested statistics with VRAM and GTT etc. Shows two
laggy parts, a small lag and then a big lag.

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Assuming your card has 1GB of VRAM, the fundamental problem is that the game
wants to use more VRAM than is available. Maybe you can try reducing the game's
graphics settings such that the 'requested VRAM' number drops below 1GB.

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

--- Comment #4 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
(In reply to Michel Dänzer from comment #3)
> Assuming your card has 1GB of VRAM, the fundamental problem is that the game
> wants to use more VRAM than is available. Maybe you can try reducing the
> game's graphics settings such that the 'requested VRAM' number drops below
> 1GB.

Indeed. The game's settings are at the minimum, and the resolution is @ 720p. I
hoped the lowest setting would alleviate the lags, but unfortunately it didn't.
However, just by reading the links from the article I linked in my original
message, I thought that it should be possible to play with less VRAM than what
is needed, as per:

"The game I'm testing needs 3.4 GB of VRAM.

Setups:
Tonga - 2 GB: It's nearly unplayable, because freezes occur too often.
Fiji - 4 GB: There is one freeze at the beginning (which is annoying
too), after that it's smooth.

So even 4 GB is not enough."

Also the descriptions of the problem seem to match mine. A problem in memory
handling?

Thanks for the suggestion though, anything that could remove or at least reduce
the lags would make the game from mostly playable to very playable (for me at
least).

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Jani Kärkkäinen from comment #4)
> "The game I'm testing needs 3.4 GB of VRAM.
> 
> Setups:
> Tonga - 2 GB: It's nearly unplayable, because freezes occur too often.
> Fiji - 4 GB: There is one freeze at the beginning (which is annoying
> too), after that it's smooth.
> 
> So even 4 GB is not enough."
> 
> Also the descriptions of the problem seem to match mine. A problem in memory
> handling?

The freeze at the beginning is most likely shader compilation.  Mesa does not
have a shader cache yet.

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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

Vedran Miletić <vedran@miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |77449


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=77449
[Bug 77449] Tracker bug for all bugs related to Steam titles
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[Bug 98693] Mad Max: Long lags when VRAM full

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https://bugs.freedesktop.org/show_bug.cgi?id=98693

Timothy Arceri <t_arceri@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

--- Comment #6 from Timothy Arceri <t_arceri@yahoo.com.au> ---
The games requirements list a card with a minimum 2GB but recommend 4GB.

As for lagging at the start with a 4GB card, r600 now has shader cache support
(at the TGSIU level at least) so this should not longer be a big issue.
Closing.

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