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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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