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: [email protected] [[email protected]] On Behalf Of Eugen Leitl [[email protected]] Sent: Monday, February 28, 2011 03:38 To: [email protected] 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. -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
