[hpsdr] NF Interrupts / buffer size

[DL7JP]

Dear all,

I received the Janus/Ozy boards a few weeks ago, and recently succeeded with
setting things up.
So, firstly, thanks to all who are involved for the great work!

There is one issue I am still struggling with: I notice occasional
interruptions of the NF coming
out of Janus; it is acceptable for 48k sampling, but gets nasty with 96k.
CPU load is < 50%, 
so I guess this is not the problem.

This NF-Distortion is minimal with buffer size 2048, anything lower produces
more. However,
a 2k buffer seems still not enough for 96k sampling, so I am wondering if
there is a way to
increase the buffer size to 4k.

Thanks for any hints ... Joachim.