question rt-patch

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Hello,
I'm testing real time patch -rt12 on kernel 2.6.21.4.
When I run netperf (netperf -H 192.168.188.207 -t UDP_STREAM -D 1
-I95,5 -l 500 -- -m 1024)
on the server  (with rt kernel) I obtain a load of ~48% on IRQ-20
(that is the hard irq related to my ethernet)
but I have no load on softirq-net-rx.
Is this a correct behaviour? Or I need to enable something on /proc /sys?
In my opinion the HARD-IRQ executes too much..
Thanks,
Nicola

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