Pasi Sjoholm [off-list ref] :
[interesting report]

The hardest part is to tell where the problem is but I think that 
rtl8139_poll-function would be good place to start looking for the bug?

readprofile didn't tell much.. Where to go next? I'm not so good 
programmer that I could find the right place to fix..

In case it could make a difference: did you check if CONFIG_8139_OLD_RX_RESET
changes the behavior or not ?

If it does not, I'd welcome a test report + log with the two attached patch
applied. The first one is just a placebo but the second one could help.

Btw, you are probably right that the issue is not related to ksoftirqd at all.

--
Ueimor