Messages in this thread | | | From | (Linus Torvalds) | Subject | Re: zero-copy TCP fileserving | Date | 4 Jun 1999 07:50:06 GMT |
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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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