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    SubjectRe: problems with e1000 and jumboframes
    On Sat, Aug 05, 2006 at 08:09:54PM +1000, Herbert Xu (herbert@gondor.apana.org.au) wrote:
    > > If you can create several skbs and link them togeter you defenitely can
    > > organize pages into frag_list, just get pages from different skb->data
    > > and free those skbs.
    >
    > Having a more flexible mechanism for managing skb_shared_info->frags
    > would definitely be an improvement. At the moment we can't indicate
    > whether the individual frags are writable so we assume every frag to
    > be read-only.

    Having one page inside frag_list writable does not make a lot of sence,
    so we really need either all of them writable, or nothing.
    And it is much less error-prone to assume that every page is read-only.

    > If we had a flag to indicate writability we could also have a flag to
    > indicate that the memory comes from kmalloc rather than alloc_page.

    Yes, that would be good, but who will give us a bit in the struct page?
    Can we recreate frag_list elements to be a bitmasks and steal couple
    of them there, so we would not increase fragment's structure size?

    > Cheers,
    > --
    > Visit Openswan at http://www.openswan.org/
    > Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
    > Home Page: http://gondor.apana.org.au/~herbert/
    > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

    --
    Evgeniy Polyakov
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