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Old 08-14-2003, 01:29 PM   #1
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Registered: Aug 2003
Location: Amsterdam
Distribution: debian
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Performance xinerama / dual-head with nvidia drivers.

Hello all,

I am using the latest nvidia drivers 4496,
and kernel 2.6.0-test2.

Two days ago I bought a dual head
vga card: FXF GeForce FX5200 and installed
it with two monitors. Configured XFree86 4.3.0
to have 'xinerama'.

Everything works "fine", except certain applications
that want to go full screen - most notably the KDE openGL
screen savers and for example id's ET.

When I play a movie with mplayer, it turns out that
the quality clearly decreases when I play it on the right
most monitor

It also struck me how CPU intensive certain applications
become when spread over the two monitors at the same time,
or even always - as if something with this xinerama has been
coded very very inefficient.

My question is now: Isn't there a (much) better way to do this?
Is it known what are the issues here and why I see abnormal
CPU usage and/or other performance degradation?
Does someone have experience with 'twinview' from nvidia on
linux? Perhaps that will work a lot better.

Especially because both monitors are connected to the SAME
video card, there shouldn't be ANY performance degradation;
I'd really like to get this working with the native support from
nvidia drivers.

Any pointers for me?

Old 08-14-2003, 02:26 PM   #2
Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
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if it's on the dual head card, then try using twinview with Xinerama info enabled (so that things don't appear across two screens like logo's etc....) best place i found for all the twinview help is the nvnews forums.

quick diagnosis to see what the slow down is would be to run xvinfo on each head to see if the second one does actually run the XV extension correctly, and isn't actaully defaulting to CPU chomping X11 output.

and what if you disable Xinerama and just have two seperate desktops (which is what i suggest... so much nicer)
Old 08-14-2003, 06:23 PM   #3
LQ Newbie
Registered: Aug 2003
Location: Amsterdam
Distribution: debian
Posts: 13

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I don't understand that.

xvinfo only accept a -display option,
but when using xinerama, I only have
one DISPLAY (only 0:0.0).

How can I run it on a seperate head
while using xinerama?


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