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    SubjectRe: problems with e1000 and jumboframes


    On Thu, 3 Aug 2006, Evgeniy Polyakov wrote:
    <CUT>
    >> Why? After your explanation that makes sense for me. The driver needs
    >> one contiguous chunk for those 9k packet buffer and thus requests a
    >> 3-order page of 16k. Or do i still do not understand this?
    >
    > Correct, except that it wants 32k.
    > e1000 logic is following:
    > align frame size to power-of-two,
    16K?

    > then skb_alloc adds a little
    > (sizeof(struct skb_shared_info)) at the end, and this ends up
    > in 32k request just for 9k jumbo frame.

    Strange, why this skb_shared_info cannon be added before first alignment?
    And what about smaller frames like 1500, does this driver behave similar
    (first align then add)?

    Best regards,

    Krzysztof Olędzki
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