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SubjectRe: zero-copy TCP

There's been a few cards around since about 1995, but I don't remember
all of them. I do remember having to debug SMP code on them though --
yechhhh!!!!

Jeff

Jes Sorensen wrote:
>
> >>>>> "Jeff" == Jeff V Merkey <jmerkey@timpanogas.com> writes:
>
> Jeff> Jes Sorensen wrote:
> >> You just told us earlier in the thread that NetWare does direct
> >> zero copy DMA but thats only half the story obviously. Up until the
> >> era of Gigabit Ethernet cards there were almost no PCI cards
> >> available that would do scatter/gather so obviously netware wasn't
> >> doing zero copy either.
>
> Jeff> I guess this is a correct statement, but Linux and everyone else
> Jeff> has the same limittion. Here, I'll refrase. Zero copies
> Jeff> irregardless of the driver model. Intel had an ethernet card
> Jeff> that did years back. So Alan's statements are also wrong since
> Jeff> he says "one DMA" not applicable to cards with a shared memory
> Jeff> window.
>
> I know cards exist that can do the job, however it has first become
> widely available with the Gigabit cards. I only know of a few 100baseT
> cards that can do it such as the Adaptec Starfire and the 3C905B
> (though I am not sure what it provides is sufficient). As for the
> Intel EEPro100 series than it's probably true they can do it, but we
> were never allowed to get information on the magic to enable it.
>
> We are working on zero copy and it makes sense for some stuff, but
> it's not as simple an issue as a lot of people make it out to be.
>
> Jes
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