realtime scheduling

[Holger Steinhaus <hsteinhaus@gmx.de>]

Hi everyone,


I am trying to set up an ISDN gateway and PBX system and want to use Xen 
to seperate some components against each other. Unfortunatly, a 
necessary device driver (zaphfc) depends on very short latencys for 
servicing interrupts. This driver is located in domain0 and everything 
runs fine, as long as all other domains are idling. If the guests get 
something to do, the zaphfc driver suffers massive buffer under/overflow 
problems.

I've found some hints about the Atropos realtime scheduler on the list, 
but some posts say, it is broken currently.

1.) Are there any releases with a working RT-like scheduler?
2.) Do you have any other idea to minimize the scheduling-related 
latency for domain 0?

Thanks,
  Holger