Re: [Myricom help #16903] Myrinet on Tyan-2720 motherboard

I just wanted to follow this up with our solution.  It turns out that we
had terrible and sometimes subtle problems due to some inadequate PCI
extender cables.  We found two solutions that were successful.  One was
to use impedance-matched Kapton cables with a ground plane.  The second,
the one we used, was to use some custom riser cards from Adex
Electronics.  With these riser cards, the system was stable, and our
Myrinet worked well.

dbr

On Mon, 2003-01-13 at 09:44, David B. Ritch wrote:
> Has anyone successfully used Myrinet with Tyan 2720 motherboards?  If
> so, was there anything unusual you did to get it to work?  Which PCI
> slots were the Myrinet boards in?
> 
> We're having trouble with Myrinet on a small cluster based on Tyan
> 2720's.  I've seen Myrinet cards show an extreme sensitivity to which
> PCI slot they are in (another cluster gave consistently incorrect
> results for HPL, until we moved the Myrinet cards to a different but
> supposedly equivalent slot), and I've seen some BIOS issues on this
> motherboard.  Both lead me to suspect that the Myrinet problems we're
> observing may have as much to do with the motherboard as the Myrinet.
> 
> Thanks!
> 
> dbr
-- 
David B. Ritch
High Performance Technologies, Inc.