Multiseat config performance

[Patrick Begou]

My aim is to build a multiseat config with 2 nvidia boards, 2 monitors, 
2 keyboards and 2 mouses for 3D CFD data visualisations.
I'm using the nvidia driver. To launch my test config I had to setup 
/etc/X11/xdm/Xservers with:

:0 local /usr/bin/Xorg :0 -config /root/xorg.conf.new  -layout seat0 
-nolisten tcp -br  vt7
:1 local /usr/bin/Xorg :1 -config /root/xorg.conf.new  -layout seat1 
-nolisten tcp -br  vt8 -sharevts

I've read on several discussions that the "-sharevts" should be used (it 
does'nt work without it) but I do not understand what this option does 
and it is not documented in xorg man page.

But I've still some problems with this config. To run a first test, I've 
used glxgears. Even if I have 2 graphic boards, if I launch glxgears in 
the 2 sessions the application is 30% slower tan if it is runing only in 
one session from7370 FPS  to 5290 FPS.

The server is a 6 cores Xeon with 24Gbytes of memory with two nvidia 
FX4800 and each glxgears is on a separate core, runing at 100%.

Thanks for your advices.

Patrick

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