Re: multiXnest

[Helge H. <hel...@ai...>]

Ander Conselvan de Oliveira wrote:

> Helge Hafting wrote:
>
>> Ander Conselvan de Oliveira wrote:
>
> >
>
>>> We're writing to annouce a new multiseat solution: multiXnest. This
>>> solution is based on a modified Xnest server which reads it's input 
>>> from
>>> the kernel event interface. This solution should work with any video
>>> card supported by the Xorg/Xfree86 X server. 
>>
>>
>> Just curious: what does this achieve, that you can't already achieve
>> with a non-nested xserver that reads input from evdev?
>
>
> The XFree86/Xorg server is able to run using several video cards but 
> with only one pointer/keyboard. 

Well, ordinary x.org (from debian and several others) is capable of
using several pointers and keyboards.  (One pointer+kbd per seat.)
That's why I asked - I already run such a setup. :-)

> A module called RAC (Resource Access Control) prevents conflicts 
> beetween the video cards, allowing a server with several cards from 
> different manufacturers to be used.

Now this may be interesting, plain xorg sometimes struggle with this.
I.e. restarting one of my xorg servers blanks the other display, so I
have to resize it (ctrl+keyboad+) to get it back.  Easy for me, confuses
my users.  RAC avoids such problems?

>
> Using the the multiXnest server, we can take advantage o the 
> XFree86/Xorg RAC in a multiseat environment. Today, we have three 
> different hardware configurations stable:
>
> - 4 seats with 1 Radeon Dual 7000/VE AGP + 1 Radeon Dual 7000/VE PCI
> - 4 seats with 1 Rage 128 + 3 Rage XL
> - 4 seats with 4 SiS 315
>
> It should work with dual nvidias and any other combination that works 
> with an ordnary xinerama x server configuration.

Can all of the users use accelerated 3D at the same time too, like they can
with a xorg setup?  (Well, with some xorg setups - not all cards will
cooperate nicely. But some do. Children tend to want to play the same
game, so a setup where not _all_ heads have the same fetures won't do.)

Helge Hafting