[Bug 83012] New: horrible performance with vblank_mode=1 which is the default

[Bug 83012] New: horrible performance with vblank_mode=1 which is the default

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https://bugs.freedesktop.org/show_bug.cgi?id=83012

          Priority: medium
            Bug ID: 83012
          Assignee: dri-devel@lists.freedesktop.org
           Summary: horrible performance with vblank_mode=1 which is the
                    default
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: aaalmosss@gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Drivers/Gallium/r600
           Product: Mesa

For example, Unigine Tropics benchmark gives 20fps, but with vblank_mode=0 it's
54fps. Games that don't turn off vsync by themselves suffer from this as well.

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[Bug 83012] Unigine Tropics horrible performance with vblank_mode=2 (which is the default) or =3

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https://bugs.freedesktop.org/show_bug.cgi?id=83012

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|horrible performance with   |Unigine Tropics horrible
                   |vblank_mode=1 which is the  |performance with
                   |default                     |vblank_mode=2 (which is the
                   |                            |default) or =3

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
(In reply to comment #0)
> For example, Unigine Tropics benchmark gives 20fps, but with vblank_mode=0
> it's 54fps.

I can only reproduce this with vblank_mode=2 or =3, though AFAICT the default
is 2.


> Games that don't turn off vsync by themselves suffer from this as well.

Actually, as long as the game can sustain at least 60 fps (or whatever the
display refresh rate is) with vblank_mode < 2, it should still get 60 fps with
vblank_mode >= 2, and IME that's indeed the case with a lot of games.

The issue with Tropics is that it can only sustain just below 60 fps, which
becomes 30 fps (half the refresh rate, since it misses every other vertical
blank period) with sync-to-vblank, and then there are some scenes where it
drops even lower.

We will hopefully be able to handle this better with DRI3/Present.

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[Bug 83012] Unigine Tropics horrible performance with vblank_mode=2 (which is the default) or =3

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https://bugs.freedesktop.org/show_bug.cgi?id=83012

--- Comment #2 from almos <aaalmosss@gmail.com> ---
Thanks for the clarification about vblank_mode. With the default vblank
settings Tropics always stays in the range of 15-25 fps.

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[Bug 83012] Unigine Tropics horrible performance with vblank_mode=2 (which is the default) or =3

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https://bugs.freedesktop.org/show_bug.cgi?id=83012

--- Comment #3 from Marek Olšák <maraeo@gmail.com> ---
Why don't we disable vsync by default? I think that's what proprietary drivers
do.

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[Bug 83012] Unigine Tropics horrible performance with vblank_mode=2 (which is the default) or =3

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https://bugs.freedesktop.org/show_bug.cgi?id=83012

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

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

--- Comment #5 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/521.

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