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    SubjectRe: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1
    On Tue, 9 Jan 2001, Ingo Molnar wrote:

    > then you'll love the zerocopy patch :-) Just use sendfile() or specify
    > MSG_NOCOPY to sendmsg(), and you'll see effective memory-to-card
    > DMA-and-checksumming on cards that support it.

    I'm confused.

    In user space, how do you know when its safe to reuse the buffer that was
    handed to sendmsg() with the MSG_NOCOPY flag? Or does sendmsg() with that
    flag block until the buffer isn't needed by the kernel any more? If it
    does block, doesn't that defeat the use of non-blocking I/O?

    davez

    --
    Dave Zarzycki
    http://thor.sbay.org/~dave/


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