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Conference noted::etherworks

Title:EtherWORKS Notes Conference
Notice:WWW server at http://ftp.digital.com/pub/DEC/adapters/
Moderator:NETCAD::STEFANI
Created:Wed Sep 01 1993
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1318
Total number of notes:5673

1294.0. "The latency of Ethernet/F.Ethernet?" by NETRIX::"eric gan@bejvc" (eric gan) Tue Apr 08 1997 05:56

How about the latency of ethernet and F.Ethernet in our products?
We need a high performanc environment for Parallel Processing, which high
speed network technology is the best one for it? FDDI, ATM, or F.E.? Maybe
the switch ethernet is enough!? :-)

any comment will be wellcom.
eric
[Posted by WWW Notes gateway]
T.RTitleUserPersonal
Name		DateLines
1294.1which latency?NETCAD::ROLKEThe FDDI Genome ProjectTue Apr 08 1997 12:2121
  Maybe the switch ethernet is enough!? :-)

1. Yes, maybe it is.  What are your requirements?  ;->

2. Could you define "latency" a bit more precisely?

   Surely you understand that a collision protocol like ethernet makes the
   specification of latency very difficult.  Even after a device driver
   has directed the hardware to transmit a frame the actual delivery of
   the frame to the network cannot be known!  This is part of why there
   are so few published latency specs for ethernet.

   For FDDI latency is much more predictable.  This has been discussed
   in depth in the literature ("FDDI Handbook") and in notes.

3. What environment are you talking about?  Is "parallel processing"
   an application suite running under a standard operating system (OpenVMS,
   WindowsNT, DOS) or is it a user-written kernel?

Regards,
Chuck