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    SubjectRe: [PATCH 3/3] Convert the UDP hash lock to RCU
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    From: Eric Dumazet <dada1@cosmosbay.com>
    Date: Mon, 06 Oct 2008 23:22:31 +0200

    > Me wondering what impact this synchronize_rcu() can have on mono-threaded
    > VOIP applications using lot of UDP sockets. What is the maximum delay of
    > this function ?

    The cost is enormous, we really can't use it here.

    I have a patch that did top-level socket destruction using RCU,
    and that didn't use synchronize_rcu(), and that killed connection
    rates by up to %20.

    I can only imagine what the cost would be if I had to add such a call
    in there.

    Really, I can't consider these changes seriously, as-is.


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