Messages in this thread | | | Date | Tue, 9 Jan 2001 17:14:33 -0800 (PST) | From | Dave Zarzycki <> | Subject | Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1 |
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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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