SysKonnect

[Jim Phillips]

Hi,

I'm guessing there are three issues:

1) The PCI bus can push about 80 MB/s to the card.

2) The Linux TCP stack isn't the greatest in the world.

3) The Scyld MPI implementation is based on MPICH and p4.  We saw
   a major performance increase by using UDP directly on 100-bT.
   I hear that LAM's implementation of MPI is much more efficient.

We tested these cards on some Sun servers and saw at best 55 Mb/s and I
think that was using jumbo frames (or whatever).

-Jim



On Thu, 8 Feb 2001, Keith Underwood wrote:

> We are using them and haven't had any problems.  Of course, we don't
> really have a "production" cluster.  Under the Scyld distribution we get
> about 40MB/s using ttcp between two hosts.  I only mention the distro
> because it's possible that they have tweaked the TCP parameters, I
> certainly haven't.  It could be that increasing the window size would
> help that some.
> 
> 					Keith
> 
> On Tue, 6 Feb 2001, Leonardo Magallon wrote:
> 
> > Hi,
> >
> > Just wondering if anyone in the list is using SysKonnect Gigabit cards and what is the opinion in regards to
> > this cards.
> >
> > Regards,
> >
> > Leonardo Magallon
> > Systems Administrator
> > Grant Geophysical, Inc.
> >
> >
> >
> >
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> 
> ---------------------------------------------------------------------------
> Keith Underwood                   Parallel Architecture Research Lab (PARL)
> keithu at parl.clemson.edu                                  Clemson University
> 
> 
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