[Beowulf] /dev/random entropy on stateless/headless nodes

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Mon Feb 28 09:29:03 EST 2011


prop delay is always an issue ...see stories about ATM message size being chosen to be small enough that packet length < propagation delay across France, making echo cancellers easier.  European PTTs wanted 32 bytes, Ma Bell wanted 64 bytes

and, of course, how TCP breaks down if you try to use it, to, say, the Moon
________________________________________
From: beowulf-bounces at beowulf.org [beowulf-bounces at beowulf.org] On Behalf Of Eugen Leitl [eugen at leitl.org]
Sent: Monday, February 28, 2011 03:38
To: beowulf at beowulf.org
Subject: Re: [Beowulf] /dev/random entropy on stateless/headless nodes

On Mon, Feb 28, 2011 at 10:27:22AM -0000, Hearns, John wrote:

> Sigh - I guess we have gone all metric since then with 10cm per
> nanosecond!

It's interesting that at 10 GBit 300 m SR fiber is an optical FIFO
for a 1500 MTU, like a modern version of mercury delay line
storage.

Once they figure out optical gate crossbars and suitable header
layout (e.g. precomputed path, header bits directly selecting
crossbar ports), purely photonic cut-through can't be far behind.

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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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