Bogdan Costescu wrote:
>
>On Mon, 19 Jul 2004, DeJiang Jin wrote:
>
>> My computers in the system have a build-in NIC and I add one more
>> NIC (3com). The former uses the tg3 driver that install with Redhat
>> Fedora OS. The later use the 3com driver that com with these NIC.
>> Both work fine for general use.
>
>What do you call a "3com NIC" ? Is it a 3c905 series or something
>else ? What is the name of the driver "that comes with these NIC" ?
in documents and system log it is called as "3Com Gigabit NIC"
the driver is 3c2000
the CD came with the NIC includes a tar file. I follow the instruction
to uncompress source files, make the drive and install it to our
computers.
>3Com makes some cards that can be driven by tg3 as well (3c996), so
>the paragraph above is quite confusing...
>
>What do you call "work fine" ? Have you tried bidirectional TCP
>traffic on a link between 2 computers using the "3Com cards" ? If UDP
>works fine or unidirectional TCP works fine, but bidirectional TCP
>doesn't, I'd expect a problem with the media autonegotiation. This
when I used the "3Com NIC", I can open a ssh session from any node to
another node in the system. a interactive ssh session do use tcp
session.
>rings a bell: if you are using Fedora Core 1 and the "3Com cards" are
>in fact 3c905B (Cyclone), then there are known problems with the
>interaction between kudzu and these cards which makes media operations
>(including autonegotiation) fail. Turn off kudzu ('chkconfig kudzu
>off') and then reboot to see if this restores the expected
>functionality.
>
>> When I installed LAM7.06, NICs of 3com are configured to use. LAM
>> can be booted but fail to run mpi programs as described above.
>
>Is booting slow ? This would confirm the autonegotiation problem.
>
>> It is more interested that if only one node in the system keeps the
>> use of 3com NIC LAM also works.
>
>This is strange, but again if autonegotiation fails, strange things
>happen...
>
>--
>Bogdan Costescu
>
>IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
>Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
>Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
>E-mail: Bogdan.Costescu_at_[hidden]
>
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