Re: Anybody normally send packets with unused options?


J. Noel Chiappa (JNC@XX.LCS.MIT.EDU)
Mon 31 Mar 86 12:37:50-EST


        I guess I have a range of reactions to this. First, if you are
really that concerned about performance, there are tons of ways to
lose, many of them in how you structure the software and the
interchange of data between the network layer and the application.
Space does not permit expanding on this, but see RFC817, in the IP
Implementors Guide (*everyone* building anything should read the set
of memos written by Dave Clark in that volume). I would think that
copying around a few bytes of options is not a big concern.
        Second, although it may be true now that there usually aren't
options, it may not be true in the future, so I wouldn't plan your
performance around that. Third, I wouldn't make the data part of a
record anyway, but consider the data and options as separate
(optional) blocks. Use the pointers and grin.

        Noel
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