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SubjectRe: zero-copy TCP fileserving
Date
In article <Pine.LNX.3.96.990603112124.4332B-100000@medusa.sparta.lu.se>,
Bjorn Wesen <bjorn@sparta.lu.se> wrote:
>
>At least for TCP reception, the architecture is in place:

Only for reception - that case is much simpler, and has a special case
anyway: if you can trust the sender for other reasons, you can decide to
skip the checksum even without having any hardware support - and the
packets are still going to look the same (so tcpdump etc aren't going to
be surprised).

Trusting the sender is normal in certain cases: loopback is the obvious
one, but so are internal networks with known hardware characteristics in
clusters, for example. So for reception you can often do this as a
valid optimization even without having any special hardware in place at
all.

Linus

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