I'd ask you if possible to try out a intel EEpro100 based network card,
or perhaps one of the tulip-based ones. The 3com drivers apparently
have problems, and I'd like to know if the machine is stable with a
driver that I know to be stable (the eepro100 in particular I have
personally used a lot on SMP enviroments, and the tulip-based ones
enough to make me feel comfortable with them).
However, once you have gotten a stable setup and thus made sure that the
only difference really is the network card, I'd still ask you to
continue to test out the broken card for a while. I'd like to know why
the driver appears broken in SMP environments. The kernel has a README
about trying to decipher any oopses you get..
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