[ag-automation] Strange task scheduling

[Zoder, Roland]

Hello all

the problem we are facing is a little complicated but I'll try to explain
it as stripped down as possible:

We are using kernel 3.10.25-roche-rt23 #3 SMP PREEMPT RT

.) we have a realtime process C (rtprio=80 - of all "our" processes this is
the one with the highest prio) which makes (heavy) use of eth0 (rtprio=90)
.) the machine also runs an proftp-server on eth1 (rtprio=50)

If we now make a (large) file up- or download via ftp the process C has no
"access" to the eth0 - that means sending and receiving of UDP packages
fails.

It seems to us as if there is some "hidden" connection between eth0 and
eth1 and that the traffic on eth1 (though lower prio) "blocks" eth0.

Any hint what this could be or how to "debug" this problem very appreciated.

Regards,

Roland Zoder
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