[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

            Bug ID: 99418
           Summary: DRI3 Stuttering while scrolling in Chromium/Chrome
                    with VBLANK off
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: lei.pero@gmail.com

Not sure where to report this issue, as title says, problem is not present with
VBLANK enabled.

Vblank is disabled in both xorg configuration and .drirc profile (and clutter
when using GNOME).

Expected behaviour (DRI2):
When scrolling pages (with smooth scroll) in Chromium for example, it defaults
at FPS=refresh rate (my case 85Hz), there is just tearline present, everything
else is smooth and fine (as with vblank enabled, except tearline).

On DRI3 however, even on simple forums/text based pages, there is
stuttering/choppy scrolling.

GPU is HD 6770, Xorg server version is 1.19.1, if you need more
information/testing, would be happy to do it.

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding Xorg log file and output of glxinfo.

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #2 from lei.pero@gmail.com ---
Created attachment 128993
  --> https://bugs.freedesktop.org/attachment.cgi?id=128993&action=edit
glxinfo

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #3 from lei.pero@gmail.com ---
Created attachment 128994
  --> https://bugs.freedesktop.org/attachment.cgi?id=128994&action=edit
Xorg.0

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #4 from lei.pero@gmail.com ---
Created attachment 128995
  --> https://bugs.freedesktop.org/attachment.cgi?id=128995&action=edit
Xorg.1

DRI2

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #5 from lei.pero@gmail.com ---
(In reply to lei.pero from comment #2)
> Created attachment 128993 [details]
> glxinfo

(In reply to Michel Dänzer from comment #1)
> Please attach the corresponding Xorg log file and output of glxinfo.

Sure, files attached. To be more accurate, it's like "ghosting" when scrolling
with DRI3 on most pages (google search results, phoronix forum etc.), even tho
CRT displays do not ghost.

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #128994|text/x-log                  |text/plain
          mime type|                            |

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #128995|text/x-log                  |text/plain
          mime type|                            |

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
I can't seem to reproduce any unexpected behaviour with radeonsi. Can you
create a video demonstrating the problem?

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #7 from lei.pero@gmail.com ---
Sure, i will, it's like performace loss, I'm not sure if video would do the
justice, I will do it in ~1 hour and attach (if possible, if not, youtube link
or something). I think this is hardware specific onr adeon driver (only?).

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #8 from lei.pero@gmail.com ---
Created attachment 129017
  --> https://bugs.freedesktop.org/attachment.cgi?id=129017&action=edit
DRI2 video

DRI2

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[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #9 from lei.pero@gmail.com ---
Created attachment 129018
  --> https://bugs.freedesktop.org/attachment.cgi?id=129018&action=edit
DRI3 Video

DRI3

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #10 from lei.pero@gmail.com ---
Videos are recorded @85FPS, I'm not sure how visivle would be on 60Hz display,
you should view it on higher refresh rate probably.

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #11 from lei.pero@gmail.com ---
Created attachment 129019
  --> https://bugs.freedesktop.org/attachment.cgi?id=129019&action=edit
DRI2 this page

This webpage example DRI2

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #12 from lei.pero@gmail.com ---
Created attachment 129020
  --> https://bugs.freedesktop.org/attachment.cgi?id=129020&action=edit
DRI3 this page

This webpage example DRI3

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #13 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #7)
> Sure, i will, it's like performace loss, I'm not sure if video would do the
> justice,

Indeed, I'm afraid I can't see much difference, though the DRI2 videos do seem
slightly smoother.

Can you create another comparison video with the environment variable
GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,cpu+temperature+GPU-load,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-compilations+num-shaders-created
set when starting chromium? It should overlay some graphs showing the framerate
and other performance related values.


> I think this is hardware specific onr adeon driver (only?).

Does it not happen using the modesetting driver instead of radeon?

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #14 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #13)
> (In reply to lei.pero from comment #7)
> > Sure, i will, it's like performace loss, I'm not sure if video would do the
> > justice,
> 
> Indeed, I'm afraid I can't see much difference, though the DRI2 videos do
> seem slightly smoother.
> 
> Can you create another comparison video with the environment variable
> GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,
> cpu+temperature+GPU-load,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-
> compilations+num-shaders-created set when starting chromium? It should
> overlay some graphs showing the framerate and other performance related
> values.
> 
> 
> > I think this is hardware specific onr adeon driver (only?).
> 
> Does it not happen using the modesetting driver instead of radeon?

Sure, I did it, will upload now. It does happen on modesetting driver
regardless of DRI version, strange. It's most visible on Chrome/ium scrolling,
but I can also notice it in standard GNOME-shell animations (for example, after
logging in startup animation is not smooth as it should be/as it is on radeon
DRI2), hope this information helps a bit. I'm very positive i can notice same
behaviour in games also (I'm not a gamer, so just a few I play).

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #15 from lei.pero@gmail.com ---
Created attachment 129048
  --> https://bugs.freedesktop.org/attachment.cgi?id=129048&action=edit
DRI2_EV1

DRI2 Chromium with EV

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #16 from lei.pero@gmail.com ---
Created attachment 129049
  --> https://bugs.freedesktop.org/attachment.cgi?id=129049&action=edit
DRI3_EV1

DRI3 Chromium with EV

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #17 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #14)
> It does happen on modesetting driver regardless of DRI version, strange.

The modesetting driver doesn't allow disabling DRI3 on the server side. You can
always disable it on the client side though with the environment variable
LIBGL_DRI3_DISABLE=1 .

The fps graph shows the same framerate in both videos, so the problem seems
rather about animation timing. It might be related to the fact that DRI3 allows
triple buffering, and might be at least partially an application issue. It
would be interesting though if it also happens with a non-AMD GPU.

BTW, is there any particular reason why you're disabling sync-to-vblank? It is
the intended mechanism for smooth animation...

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https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #18 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #17)
> (In reply to lei.pero from comment #14)
> > It does happen on modesetting driver regardless of DRI version, strange.
> 
> The modesetting driver doesn't allow disabling DRI3 on the server side. You
> can always disable it on the client side though with the environment
> variable LIBGL_DRI3_DISABLE=1 .
> 
> The fps graph shows the same framerate in both videos, so the problem seems
> rather about animation timing. It might be related to the fact that DRI3
> allows triple buffering, and might be at least partially an application
> issue. It would be interesting though if it also happens with a non-AMD GPU.
> 
> BTW, is there any particular reason why you're disabling sync-to-vblank? It
> is the intended mechanism for smooth animation...

I didn't know that about modesetting driver, anyway, even with
LIBGL_DRI3_DISABLE=1 same thing happens.

I don't how to disable tripple buffering to test it and if it's possible, man
pages do not show anything about it. I've also tested on nouveau, same thing
happens, architecture is completely different with Intel C2D CPU @3.0GHz and
GT-210 (on this PC it's AMD FX-4100 CPU stock), both modesetting driver and
nouveau with DRI3 act the same, while nouveau with DRI2 works well same as
radeon with DRI2. If you have any idea where to look for further testing, I can
do it.

Yes, there are reasons, on some webpages (it is probably fault of page coding
or PC CPU power) CHromium/Firefox can't keep up with 85FPS, while drop happens,
when VBLANK is enabled, I'm getting less responsive mouse wheel (lag), while
with VBLANK disabled FPS drop is less severe, and there are is no input lag on
wheel or anything. That is main reason, among others that can be solved with
scripts (too alzy to type command when starting application without it = game
or something), also, videos do seem smoother (VLC, youtube etc.) with VBLANK
disables, so there are multiple reasons why I do it.

So, any way to disable tripple buffer? Or if you have idea what might be the
cause of the problem?

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--- Comment #19 from lei.pero@gmail.com ---
Ok, i think I've found culprint to the problem, it's acceleration method, not
DRI3 actually, so maybe i should change the title of the bug report?

Now, with DRI3 and Option "AccelMethod" "EXA", it's actually even better
compared to DRI2 (one tearline, instead of two on DRI2), the problem is glamor
actually (or something connected to it), since it is default on DRI3.

I assume it will act the same on nouveau driver (didn't tried yet), and I think
it's worth investigating further.

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--- Comment #20 from lei.pero@gmail.com ---
Scrach post above, I didn't realized that EXA forces DRI2.

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--- Comment #21 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #18)
> I didn't know that about modesetting driver, anyway, even with
> LIBGL_DRI3_DISABLE=1 same thing happens.

Maybe chromium doesn't pass on the environment variable to its GPU helper
process, or maybe there was still a chromium process around.


> I don't how to disable tripple buffering to test it and if it's possible,

Only by changing the code,
mesa/src/loader/loader_dri3_helper.c:dri3_update_num_back(). E.g. set num_back
= 1 in the else case.

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--- Comment #22 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #21)
> (In reply to lei.pero from comment #18)
> > I didn't know that about modesetting driver, anyway, even with
> > LIBGL_DRI3_DISABLE=1 same thing happens.
> 
> Maybe chromium doesn't pass on the environment variable to its GPU helper
> process, or maybe there was still a chromium process around.
> 
> 
> > I don't how to disable tripple buffering to test it and if it's possible,
> 
> Only by changing the code,
> mesa/src/loader/loader_dri3_helper.c:dri3_update_num_back(). E.g. set
> num_back = 1 in the else case.

Ok, I've built mesa with that parameter changed and installed, same behavior.
I've cloned just "git://anongit.freedesktop.org/git/mesa/mesa" , it should be
enough.

On the side note, if default is glamor, EXA definitively works better on my
config (not huge difference, but there is difference). I will try to investiate
more, but I'm really not sure where to look.

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--- Comment #23 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #22)
> Ok, I've built mesa with that parameter changed and installed, same
> behavior. I've cloned just "git://anongit.freedesktop.org/git/mesa/mesa" ,
> it should be enough.

Did you verify that it's hitting the path you modified? E.g. if chromium is
fullscreen and there's no compositor, it may hit the if case instead of the
else case. Maybe try changing the if case to 2 buffers as well.

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--- Comment #24 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #23)
> (In reply to lei.pero from comment #22)
> > Ok, I've built mesa with that parameter changed and installed, same
> > behavior. I've cloned just "git://anongit.freedesktop.org/git/mesa/mesa" ,
> > it should be enough.
> 
> Did you verify that it's hitting the path you modified? E.g. if chromium is
> fullscreen and there's no compositor, it may hit the if case instead of the
> else case. Maybe try changing the if case to 2 buffers as well.

Yeah, it is the same, but, it might be that it is not a bug with mesa at
all(?).

Long story short, after investigating further, it turns out that DRI3 works
quite well with compiz, marco and in lxde, lxqt. The actual problem happens
only when mutter is window manager (still, it doesn't explain why it works well
with DRI2), I've tried MATE DE with different WM and as expected, all others
work well except mutter.

Hope this new info helps, and if it turns out it is mutter bug and not DRI3
(doesn't make sense), I apologize for wasting your time (should have done this
earlier...), and we can close/delete this bug report. It still doesn't make any
sense why it would work well with DRI2 but not DRI3 on mutter.

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--- Comment #25 from Michel Dänzer <michel@daenzer.net> ---
So maybe it actually depends on whether mutter uses DRI3 or DRI2? You can test
this by enabling DRI3 on the server side but (re-)starting mutter with

 LIBGL_DRI3_DISABLE=1 mutter --replace

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--- Comment #26 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #25)
> So maybe it actually depends on whether mutter uses DRI3 or DRI2? You can
> test this by enabling DRI3 on the server side but (re-)starting mutter with
> 
>  LIBGL_DRI3_DISABLE=1 mutter --replace

Yeah, result is smooth experience (and broken gnome-shell lol), I was convinced
that same bahviour happens with other WM's, I remmember when using Ubuntu that
there was same problem, but i was using custom gnome-flashback session, still
was convinced same thing happened with compiz and metacity, obviously i should
have tested it, not concluding from (erroneous) memory.

So, this is connected with mutter, and probably does not belong here but on
gnome project bug report? Latter i will try some environment variables for
clutter to investigate it further.

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Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #27 from Michel Dänzer <michel@daenzer.net> ---
Yeah, sounds like a mutter bug then. Anyway, thanks for the report and
cooperation in narrowing it down.

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--- Comment #28 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #27)
> Yeah, sounds like a mutter bug then. Anyway, thanks for the report and
> cooperation in narrowing it down.

Yeah, will report it on GNOME project, sorry again, I should have tested it
more in depth before reporting, and thanks for the assistance.

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--- Comment #29 from lei.pero@gmail.com ---
Just want to add few things, did reported bug to gnome project, but, problem
does not happen when "vblank_mode" value in .drirc configuration file is set to
1 (instead of 0 I've used before).

Thought it would be nice to inform you about that since .drirc configuration
belongs here, still could be mutter/clutter problem tho.

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--- Comment #30 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #29)
> Just want to add few things, did reported bug to gnome project, but, problem
> does not happen when "vblank_mode" value in .drirc configuration file is set
> to 1 (instead of 0 I've used before).

1 means sync-to-vblank is disabled by default, but the application can enable
it explicitly. 0 means sync-to-vblank is disabled regardless of what the
application wants. So this could actually be considered a configuration issue
instead of a bug anywhere.

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--- Comment #31 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #30)
> (In reply to lei.pero from comment #29)
> > Just want to add few things, did reported bug to gnome project, but, problem
> > does not happen when "vblank_mode" value in .drirc configuration file is set
> > to 1 (instead of 0 I've used before).
> 
> 1 means sync-to-vblank is disabled by default, but the application can
> enable it explicitly. 0 means sync-to-vblank is disabled regardless of what
> the application wants. So this could actually be considered a configuration
> issue instead of a bug anywhere.

Yeah, I realized that, It's still odd behaviour, in both cases Chrome caps FPS
to refresh rate (this case 85FPS), but using DRI3 using mutter/clutter, for
some reason it creates continuous stutters, even tho FPS is the same and all
other parameters are equal. It really looks (when viewed live) as if FPS is not
equal to refresh rate.

Just wanted to inform you guys on this, it is still probably mutter/clutter
configuration problem in the code (since it happens only there), it doesn't
follow configuration in .drirc as other WM's.

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--- Comment #32 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #31)
> It's still odd behaviour, in both cases Chrome caps FPS to refresh rate (this
> case 85FPS),

Sounds like Chrome just has its own framerate throttling which works
independently from sync-to-vblank.


> but using DRI3 using mutter/clutter, for some reason it creates
> continuous stutters, even tho FPS is the same and all other parameters are
> equal. It really looks (when viewed live) as if FPS is not equal to refresh
> rate.

It's possible that the mutter framerate doesn't match the refresh rate (you can
check by setting GALLIUM_HUD=fps for the mutter process), but it's also
possible it's simply due to unfortunate interaction between the Chrome and
mutter frame timings.


> [...] it is still probably mutter/clutter configuration problem in the code
> (since it happens only there), it doesn't follow configuration in .drirc as
> other WM's.

Not really. By setting vblank_mode=0, you're forcing mutter to run in a way it
doesn't intend. If doing so breaks something, that can hardly be considered a
mutter bug, and you get to keep all the pieces. :)

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--- Comment #33 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #32)
> (In reply to lei.pero from comment #31)
> > It's still odd behaviour, in both cases Chrome caps FPS to refresh rate (this
> > case 85FPS),
> 
> Sounds like Chrome just has its own framerate throttling which works
> independently from sync-to-vblank.
> 
> 
> > but using DRI3 using mutter/clutter, for some reason it creates
> > continuous stutters, even tho FPS is the same and all other parameters are
> > equal. It really looks (when viewed live) as if FPS is not equal to refresh
> > rate.
> 
> It's possible that the mutter framerate doesn't match the refresh rate (you
> can check by setting GALLIUM_HUD=fps for the mutter process), but it's also
> possible it's simply due to unfortunate interaction between the Chrome and
> mutter frame timings.
> 
> 
> > [...] it is still probably mutter/clutter configuration problem in the code
> > (since it happens only there), it doesn't follow configuration in .drirc as
> > other WM's.
> 
> Not really. By setting vblank_mode=0, you're forcing mutter to run in a way
> it doesn't intend. If doing so breaks something, that can hardly be
> considered a mutter bug, and you get to keep all the pieces. :)

You might be very right about unfortunate interaction between Chrome (and
Chromium) and mutter frame timings, since I did tried "CLUTTER_DEFAULT_FPS=85"
(and 84) env. value and it made 0 difference.

Yeah, but by setting 1 and using any other WM results in Chromium/Chrome being
VSYNC-ed, or at least it looks like it is, there's no tear line and picture is
smooth as it can be (while on mutter/clutter there's tear line), so for the
sake of standardisation i would call it mutter/clutter configuration bug that
will probably stay unresolved, plus it doesn't explain DRI2 behavior that
follows same standard :).

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--- Comment #34 from Michel Dänzer <michel@daenzer.net> ---
(In reply to lei.pero from comment #33)
> Yeah, but by setting 1 and using any other WM results in Chromium/Chrome
> being VSYNC-ed, [...]

With a compositing manager, tearing or not is up to that. 


> [...] i would call it mutter/clutter configuration bug [...]

vblank_mode is Mesa configuration overriding mutter's intent, so it cannot
reasonably be called that.


> plus it doesn't explain DRI2 behavior that follows same standard :).

It's probably just a happy accident that it works better according to your
criteria with DRI2.

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--- Comment #35 from lei.pero@gmail.com ---
(In reply to Michel Dänzer from comment #34)
> (In reply to lei.pero from comment #33)
> > Yeah, but by setting 1 and using any other WM results in Chromium/Chrome
> > being VSYNC-ed, [...]
> 
> With a compositing manager, tearing or not is up to that. 
> 
> 
> > [...] i would call it mutter/clutter configuration bug [...]
> 
> vblank_mode is Mesa configuration overriding mutter's intent, so it cannot
> reasonably be called that.
> 
Well, whatever it is, it affects only mutter/mutter based WM's, for now,
workaround is to use vblank_mode value "1".
> 
> > plus it doesn't explain DRI2 behavior that follows same standard :).
> 
> It's probably just a happy accident that it works better according to your
> criteria with DRI2.

Or unhappy accident for DRI3 :).

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