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    SubjectRe: [RFC] HOWTO use NAPI to reduce TX interrupts
    From: Roland Dreier <>
    Date: Mon, 21 Aug 2006 17:29:05 -0700

    > This is a digression from spidernet, but what if a device is able to
    > generate separate MSIs for TX and RX? Some people from IBM have
    > suggested that it is beneficial for throughput to handle TX work and
    > RX work for IP-over-InfiniBand in parallel on separate CPUs, and
    > handling everything through the ->poll() method would defeat this.

    The TX work is so incredibly cheap, relatively speaking, compared
    to the full input packet processing path that the RX side runs
    that I see no real benefit.

    In fact, you might even get better locality due to the way the
    locking can be performed if TX reclaim runs inside of ->poll()
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