periodic task period

[Dmitry Kargapolov <dk@gentex.ru>]

Hello.
I have tested RTLinux version 2.2 on i386 sx 40Mhz.
The RTLinux design.pdf was saying:
"A RTLinux periodic task runs within 25 microseconds
of its scheduled time on the same hardware..."
(under the "same hardware" was meant "generic x86")
I am interested in submillisecond diapason of
the task scheduling.
I made simple test with single task. This task
only reads some port. I successfully tested it with
scheduling period 1ms, but when I tried to set period
to 100mks (pthread_make_periodic_np(..., 100000))
the rt-module was crashed...
What is the minimum period of task scheduling on
my i386-40? What about promised 25 mks?
-- 
Sincerely,
Dmitry Kargapolov, ICQ 54000305, dk@gentex.ru