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    SubjectRe: High contention on the sk_buff_head.lock
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    From: Sven-Thorsten Dietrich <sven@thebigcorporation.com>
    Date: Wed, 18 Mar 2009 18:43:27 -0700

    > Do we have to rule-out per-CPU queues, that aggregate into a master
    > queue in a batch-wise manner?

    That would violate the properties and characteristics expected by
    the packet scheduler, wrt. to fair based fairness, rate limiting,
    etc.

    The only legal situation where we can parallelize to single device
    is where only the most trivial packet scheduler is attached to
    the device and the device is multiqueue, and that is exactly what
    we do right now.


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