[Beowulf] [FoRK] seamicro fabric?

Eugen Leitl eugen at leitl.org
Mon Mar 5 12:07:10 PST 2012


----- Forwarded message from Aaron Burt <aaron at bavariati.org> -----

From: Aaron Burt <aaron at bavariati.org>
Date: Mon, 5 Mar 2012 11:31:37 -0800
To: fork at xent.com
Subject: Re: [FoRK] [Beowulf] seamicro fabric?
User-Agent: Mutt/1.5.20 (2009-06-14)
Reply-To: Friends of Rohit Khare <fork at xent.com>

On Mon, Mar 05, 2012 at 05:23:02AM +0100, Eugen Leitl wrote:
> From: Mark Hahn <hahn at mcmaster.ca>
> 
> Has anyone found an informative description of the Seamicro fabric?

I hope Mark has repeated his search; http://google.com?q=anil+rao+fabric
and http://google.com?q=seamicro+interconnect turn up lots of info.

A 2011 PDF[1] at Seamicro sez, "It is a three-dimensional torus, with both
path redundancy and diversity. The fabric is FLIT-based and wormhole-
routed, with integrated virtual-channel technology to manage congestion,
and has a throughput of 1.2 Terabits/sec."

Looks like proc boards use PCIe interconnects, like the old cPCI blades.

The more interesting bit (to me) is the possibility raised in an older
article[2] that Rao and Lauterbach are thinking of turning their
interconnect into a datacenter-level fabric.  Infiniband II, anyone?

Remembering the days of physically separate frontend and I/O processors,
  Aaron

[1] http://www.seamicro.com/sites/default/files/TO1_SM10000_Technology_Overview.pdf
[2] http://www.datacenterknowledge.com/archives/2010/01/26/seamicro-more-than-just-low-power-servers/
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