Messages in this thread |  | | Date | Sat, 02 Sep 2000 20:07:36 -0600 | From | "Jeff V. Merkey" <> | Subject | Re: zero-copy TCP |
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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 > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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