[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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https://bugs.freedesktop.org/show_bug.cgi?id=92271

Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Server/Ext/GLX              |Driver/nouveau
           Assignee|xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org       |nouveau-PD4FTy7X32lNgt0PjOBp93rCq3LdnpKM@public.gmane.org
                   |                            |rg

--- Comment #14 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
Aha, you're quite right: the issue exists if I build the xorg-x11-drv-nouveau
git snapshot we're using against X server 1.17.2, it's not the server at all.

Apologies for missing that - I was thinking "downgrade X server" and just threw
packages at the transaction till it worked, soI actually didn't notice there
was a significant difference between the nouveau driver versions too.

I will do some bisecting between 1.0.11 and the snapshot we're at and see if I
can see where it broke. I don't see anything between July 29 (when we took the
snapshot) and now that looks like it'd be relevant.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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https://bugs.freedesktop.org/show_bug.cgi?id=92271

--- Comment #15 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
So I bisected it down and it looks like the cause is
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=241e7289f25a342a457952b9b0e539c2f0b81d99
, "enable dri3 support without glamor".

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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https://bugs.freedesktop.org/show_bug.cgi?id=92271

--- Comment #16 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
You can force DRI (in a sufficiently new nouveau snapshot) by doing

Option "DRI" "2"

No idea what causes the slowdown tbh. All this DRI stuff is a little beyond me.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #17 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
Note: according to the logs, the system is using DRI2, not DRI3. So it seems
like somehow, the DRI3 patch breaks the DRI2 case?

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #18 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to Adam Williamson from comment #17)
> Note: according to the logs, the system is using DRI2, not DRI3. So it seems
> like somehow, the DRI3 patch breaks the DRI2 case?

Don't trust everything you read online :) Pretty sure nothing would be printed
differently, at least not in your version.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #19 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
Well, the code still claims that it defaults to DRI 2:

http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/tree/src/nv_driver.c#n1080

and Fedora is doing nothing to patch that.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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https://bugs.freedesktop.org/show_bug.cgi?id=92271

--- Comment #20 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=6296145654b78518f3299bb5887f224f0d3810fd

Only starting August. You said your snapshot was in July.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #21 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
ah, that could explain it. I'm currently running a build of git master, we'll
see how that behaves, perhaps it'll work by default and show the bug if I force
DRI3...

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #22 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
So...yeah, it more or less works with a current git snapshot, except there's
one odd thing...I have a file in /etc/X11/xorg.conf.d with this content:

Section "Device"
        Identifier  "nouveau"
        Driver      "nouveau"
        Option    "Monitor-DVI-I-1"    "Right Monitor"
    Option    "Monitor-DVI-I-2"    "Left Monitor"
EndSection

Section "Monitor"
    Identifier    "Left Monitor"
    Option    "Primary"    "True"
    Option    "Rotate"    "left"
EndSection

Section "Monitor"
    Identifier    "Right Monitor"
    Option    "RightOf"    "Left Monitor"
        Option  "Rotate"        "left"
EndSection

it's to rotate my screens on desktops that don't do their own RandR stuff (and
it used to work for GDM too, doesn't any more). But for some reason, if I have
that file active with latest git nouveau, X won't start; I have to rename it to
.conf.bak to make X start. Still, if I do that, it does run fine and at full
speed, so this one looks like a bug tied to the particular nouveau DDX git
snapshot Fedora is using. Guess I should move it downstream?

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #23 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to Adam Williamson from comment #22)
> it's to rotate my screens on desktops that don't do their own RandR stuff
> (and it used to work for GDM too, doesn't any more). But for some reason, if
> I have that file active with latest git nouveau, X won't start; I have to
> rename it to .conf.bak to make X start. Still, if I do that, it does run
> fine and at full speed, so this one looks like a bug tied to the particular
> nouveau DDX git snapshot Fedora is using. Guess I should move it downstream?

Need some logs. That config seems generally fine.

Also, does it run at full speed if you force DRI3?

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #24 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
Damnit, sorry - bad test. Actually the current git build of nouveau is flat out
failing to load at all; it's working when the config file isn't there because
it's falling back to modesetting. I'll poke a bit more...

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with X server 1.18 with rotated output

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--- Comment #25 from Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> ---
OK, so I finally got a good test. I built a snapshot exactly at the DRI
2-by-default commit -
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=6296145654b78518f3299bb5887f224f0d3810fd
- and that one loads OK. And indeed it behaves as we suspected: it works at
full speed by default, if I force DRI 3, it loads but runs very slowly.

So the slowness-when-rotated is a genuine bug that's specific to DRI 3 mode, I
guess.

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with rotated output under DRI 3

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Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Unusably slow OpenGL        |Unusably slow OpenGL
                   |performance on nouveau      |performance on nouveau
                   |(GeForce 9600 GT) with X    |(GeForce 9600 GT) with
                   |server 1.18 with rotated    |rotated output under DRI 3
                   |output                      |

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with rotated output under DRI 3

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Adam Williamson <adamw-cfjF3rc+CpsYNetmKr+vY16hYfS7NtTn@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|blocker                     |normal

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with rotated output under DRI 3

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--- Comment #26 from poma <pomidorabelisima-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---

Same with the NVIDIA G98,
Xfce, GNOME and KDE
https://bugs.freedesktop.org/show_bug.cgi?id=92307#c32

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with rotated output under DRI 3

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--- Comment #27 from poma <pomidorabelisima-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Still there, with
X.Org X Server 1.18.3
OpenGL version string: 3.0 Mesa 11.2.0

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[Bug 92271] Unusably slow OpenGL performance on nouveau (GeForce 9600 GT) with rotated output under DRI 3

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Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #28 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- 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/xorg/driver/xf86-video-nouveau/issues/220.

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