frozen system at >4 kHz

[Olaf Petzold <opetzold@wit.regiocom.net>]

Hallo,

I changed the frequency of my rt-mod from 1kHz to 4kHz with the result, the
system is frozen (higher frequencies as well). SysRQ doesn't work. Who has an
idea why? I'm using rh6.2/rtl-2.2. The module itself is using mbuff, comedi and
alocates about 500k memory on the heap by vmalloc. It's designed for use with
the posix interface and uses rtf's for commands. The thread code itself uses
rtl_hard_savef_and_cli(flags)/rtl_hard_restore_flags(flags).

Thanks	Olaf