Q: ATM Beowulf
Gerry Creager (N5JXS)
gerry.creager at tamu.edu
Wed Nov 12 09:38:10 EST 2003
To expand on that a little bit, the overhead associated withn LANE is
also going to be a problem for you, even ic communications will be a
small segment of your cluster activity.
If your application were capable of talking directly at the ATM layer,
and not have to go through the framing and conversion issues with either
LANE or IPOA, then you could see some advantages. However, the issue of
sending 1500 byte... or 9kB... packets over ethernet, taking advantage
of the somewhat faster encoding we see for ethernet today, far outstrips
the potential benefits of ATM on a cluster environment. And making up
1500 byte packets, then resending them as 53 byte cells, with 10%
overhead, just doesn't make sense anymore save in a connection-oriented
network like WAN or Carrier. And, fwiw, the carriers are also dropping
ATM for GBE, 10GBE and carrying same over multiplexed lamdas in the
John Hearns wrote:
> On Wed, 12 Nov 2003, Rafael Angel Garcia Leiva wrote:
>>Does make sense to use LAN emulation over ATM for this kind of clusters? Has
>>anyone experimented with ATM interconnections? Do you think is it
>>cost-effective today (specially compared to Fast / Gigabit Ethernet)?
> The list will know that a few years ago I was very enthusuastic
> about ATM. I put in a leading edge ATM network at a hospital in
> the UK for medical imaging. I was a proponent of using ATM for clustering.
> These days, I would say the idea is not so good.
> You get built-in Gigabit network interfaces on many motherboards,
> and Gigabit switches are really cheap.
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Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University
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