Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)

[Felix von Leitner <leitner@fefe.de>]

Thus spake Andrew Morton (andrewm@uow.edu.au):
> Conclusions:

>   For a NIC which cannot do scatter/gather/checksums, the zerocopy
>   patch makes no change in throughput in all case.

>   For a NIC which can do scatter/gather/checksums, sendfile()
>   efficiency is improved by 40% and send() efficiency is decreased by
>   10%.  The increase and decrease caused by the zerocopy patch will in
>   fact be significantly larger than these two figures, because the
>   measurements here include a constant base load caused by the device
>   driver.

What is missing here is a good authoritative web ressource that tells
people which NIC to buy.

I have a tulip NIC because a few years ago that apparently was the NIC
of choice.  It has good multicast (which is important to me), but AFAIK
it has neither scatter-gather nor hardware checksumming.

Is there such a web page already?
If not, I volunteer to create amd maintain one.

Felix
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