D-Link switch and ecc-memory.

Donald Becker becker at scyld.com
Mon Jan 15 19:29:09 EST 2001


On Mon, 15 Jan 2001, Jon Tegner wrote:

> we have a small system, eight nodes with D-Link DFE-530 TX nics and a
> D-Link DES-3225G switch.
...
> After an update of PROM code and Runtime Code on the switch the
> situation was improved slightly (i.e, we got acceptable performance
> using three nodes even if the switch was not restarted).

Are you implying that more than three nodes causes additional problem

> It doesn't seem to matter if we specify full-duplex for the nics in
> conf.modules, and I wonder if anyone else have experienced similar
> problems?

Use 'cat /proc/net/dev' to check for errors.  You should have very few
errors in a properly working cluster network.  Specifically, there
should never be "frame" or "Tx carrier" errors.

The 'mii-diag' program is useful for verifying that the network
configuration is correct.  All MII transcievers provide basic connection
information such as speed, duplex and negotiated flow control.  Some MII
transceiver provide additional information such as a symbol error count
and noise margins.

Donald Becker				becker at scyld.com
Scyld Computing Corporation		http://www.scyld.com
410 Severn Ave. Suite 210		Second Generation Beowulf Clusters
Annapolis MD 21403			410-990-9993


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