"Does TCP Need an Overhaul?" (internetevolution, via slashdot)

From: Paul Vixie (no email)
Date: Fri Apr 04 2008 - 21:51:27 EDT

  • Next message: Christopher Morrow: "Re: "Does TCP Need an Overhaul?" (internetevolution, via slashdot)"

    in <http://www.internetevolution.com/author.asp?section_id=499&doc_id=150113>
    larry roberts says:

            ..., last year a new alternative to using output queues, called "flow
            management" was introduced. This concept finally solves the TCP
            unfairness problem and leads to my answer: Fix the network, not TCP.

            ...

            What is really necessary is to detect just the flows that need to slow
            down, and selectively discard just one packet at the right time, but
            not more, per TCP cycle. Discarding too many will cause a flow to
            stall -- we see this when Web access takes forever.

            Flow management requires keeping information on each active flow,
            which currently is inexpensive and allows us to build an intelligent
            process that can precisely control the rate of every flow as needed to
            insure no overloads. Thus, there are now two options for network
            equipment:

             o Random discards from output queues bIntelligent rate control of
               every flow -- creates much TCP unfairness

             o Intelligent rate control of every flow -- eliminates most TCP
               unfairness

            ...

    i wouldn't want to get in an argument with somebody who was smart and savvy
    enough to invent packet switching during the year i entered kindergarden,
    but, somebody told me once that keeping information on every flow was *not*
    "inexpensive." should somebody tell dr. roberts?

    (i'd hate to think that everybody would have to buy roberts' (anagran's)
    Fast Flow Technology at every node of their network to make this work. that
    doesn't sound "inexpensive" to me.

  • Next message: Christopher Morrow: "Re: "Does TCP Need an Overhaul?" (internetevolution, via slashdot)"





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