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SubjectRe: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1
>>>>> David S Miller <> writes:

> I would have thought one of the main interests of doing
> something like this would be to allow us to speed up large
> writes to the socket for ncpfs/knfsd/nfs/smbfs/...

> This is what TCP_CORK/MSG_MORE et al. are all for, things get
> coalesced perfectly. Sending in a vector of pages seems nice,
> but none of the page cache infrastructure works like this, all
> of the core routines work on a page at a time. It actually
> simplifies a lot.

> The writepage interface optimizes large file writes to a socket
> just fine.

OK, but can you eventually generalize it to non-stream protocols
(i.e. UDP)?
After all, it doesn't make sense to differentiate between zero-copy on
stream and non-stream sockets, and Linux NFS, at least, remains
heavily UDP-oriented...

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