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    On Thu, 14 Sep 2000, David S. Miller wrote:

    > Date: Thu, 14 Sep 2000 04:44:53 -0400
    > From: Jeff Garzik <jgarzik@mandrakesoft.com>
    >
    > Does anyone think that allocating skbs during system idle time
    > would be useful?
    >
    > I really don't like these sorts of things, because it makes an
    > assumption as to what memory is about to be used for.
    >
    > What if you were to preallocate skbs while idle, then the next thing
    > which happens is some userland program walks over a 2gb dataset and
    > no network activity happens at all.
    >

    The FF code of the tulip does have skb recycling code.
    And i belive Jes' acenic code does or did at some point.
    Robert Olson and I were thinking of taking out that code out of the
    tulip for reasons such as you talk about (and the thought maybe that
    the per-CPU slab might have obsoleted that requirement). We did some tests
    with 2.4.0-test7 and were suprised to observe that at high rate of input
    packets, it still made as a big a difference as 7000 packets per second
    ;-> i.e we got 7Kpps more by using skb recycling.

    Dave, would a scheme with an aging of the skbs in the recycle queue
    and an upper bound of the number of packets sitting on the queue be
    acceptable?
    Maybe ANK can make a comment as well.
    Robert and I plan to play with such a scheme for a long time under many
    different scenarios and come with numbers (throughput etc) instead of
    "here's a patch and intuitively it makes sense".
    This is really a 2.5 thing if acceptable.

    cheers,
    jamal

    PS:- OLS patch coming soon; a few more tests (as time permits);->

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