[Bug 15751] New: nouveau very slow with screen size > 2048

[Bug 15751] New: nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15751

           Summary: nouveau very slow with screen size > 2048
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: sturnber-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


I have two monitors side-by-side using the nouveau driver.  This setup
previously worked fine with the nvidia driver.  In xorg.conf if I set "Virtual
2560 1024" in the Screen section the performance is horrible.  If I set the
width to anything greater than 2048 I have the same problem.  I can set the
screen size to 2048x2048 and awkwardly have the monitors on top of each other
and performance is fine.  It is unclear to me why 2048x2048 would have better
performance than 2560x1024 or even 2304x864.  

From lspci:
VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 4000] (rev c1)


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[Bug 15751] nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15751





--- Comment #1 from Maarten Maathuis <madman2003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-29 00:41:05 PST ---
The reason is quite simple, above 2048x2048 2d acceleration is completely
turned off. I don't know if this limit is the right one for NV17/NV18, being a
mixed gf2/gf4 design.


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[Bug 15751] nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15751





--- Comment #2 from Maarten Maathuis <madman2003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-29 00:50:50 PST ---
Some more googling reveals it might be the correct limit. Even with this
limitation it's theoretically possible to use the monitors the way you want
(giving each crtc their own texture, which would work). There is a prototype
called shatter (which ofcource requires driver modifications), so there is hope
for the future.


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[Bug 15751] nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15751





--- Comment #3 from Scott Turnberg <sturnber-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2008-04-29 07:57:39 PST ---
Thanks for the quick reply.  I'll keep an eye out for the develpment of
shatter.


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[Bug 15751] nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=15751


Gaetano Canepa <gaetano.canepa-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |21186




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[Bug 15751] nouveau very slow with screen size > 2048

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=15751

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

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

--- Comment #4 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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