RPC Technologies

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2 total messages Started by Philip Earnhardt Mon, 13 Aug 1990 20:33

#238

Author: Philip Earnhardt
Date: Mon, 13 Aug 1990 20:33

24 lines
1752 bytes

In <4bc8788d.20b6d@apollo.HP.COM> mishkin@apollo.HP.COM (Nathaniel Mishkin) writes:

>>On page 43, the "Suggested Time" for fragment acknowledgment is 1
>>second (it's my understanding that all of these timers are hardwired
>>in a given NCS implementation). Isn't a 1-second timeout far too
>>short for fragment acknowledgment? If the mean round-trip time for 2
>>Internet hosts is 5 seconds, won't this mean that fragments will get
>>needless multiple retransmissions?

> Ugh.  Suffice it to say that the spec should be taken with a grain of
> salt when it comes to parameters such as the one you're pointing to.
> We focused most of our energy on specifying the non-parametric aspects
> of the protocol.  A correct implementation (e.g., NCS 2.0) would do round
> trip time estimations.

The Network Computer Architecture Book (describing NCS 1.x implementations)
gives "suggested times" for timer implementations.  For your current products,
how do retransmission timers work?  Specifically, do NCS 1.x implementations
on top of UDP/IP have a fixed retransmission timer or do they employ some sort
of adaptive algorighm?

Phil Earnhardt          Netwise, Inc.  2477 55th St.  Boulder, CO 80301
Phone:303-442-8280      UUCP: onecom!wldrdg!pae
My opinions do not reflect any official position of Netwise.

Re: RPC Technologies

#246

Author: Nathaniel Mishkin
Date: Mon, 20 Aug 1990 20:03

16 lines
1233 bytes

In article <1990Aug13.203329.13458@athena.mit.edu>, pae@athena.mit.edu
(Philip Earnhardt) writes:
|> The Network Computer Architecture Book (describing NCS 1.x implementations)
|> gives "suggested times" for timer implementations.  For your current
products,
|> how do retransmission timers work?  Specifically, do NCS 1.x implementations
|> on top of UDP/IP have a fixed retransmission timer or do they employ
some sort
|> of adaptive algorighm?

The former.  As I said, this is a deficiency that's being corrected.

                    -- Nat Mishkin
                       Cooperative Object Computing Operation
                       Hewlett-Packard Company
                       mishkin@apollo.hp.com

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