> effected connections will always be TCP connections and have a
> well-known application header structure. AFAICT, this just requires
And in real life variable length tcp header, but that can be dealt with by
the firmware I trust
> > Until you can lock user pages down nicely and DMA from them it is not a
> > performance improvement to checksum in hardware.
>
> The file serving app I'm working with doesn't have any reason to touch
> the data, so I'm going to do the DMA straight from the disk buffer
> cache. The only user-level data that needs to go out is a relatively
> small application header, which can easily be copied into kernel space.
Then you should get results that way
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