Messages in this thread | | | Subject | Re: SMC Etherpower II / EPIC/100 83C170 | From | Andi Kleen <> | Date | 23 Apr 1997 07:36:05 +0200 |
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Illuminati Primus <vermont@gate.net> writes:
> A unique feature is the ability to transfer just the header of received > packets and wait for the driver to provide a buffer for the rest of the > data. This enables a secure U-Net style direct-to-user-address-space > receive routine. > ... > I think I remember reading David Miller saying something about how > networking could be significantly sped up by minimizing the amount of data > that has to be copied around... How much work would it take to do that > with this card? The problem with this is that the eepro100 doesn't do TCP/UDP checksums in hardware. This means that some routine has to go over the data once anyway and a checksum() and a copy+checksum() operation has ca the same cost (it's memory bound, not CPU bound). So this this feature would only help for unchecksummed UDP or non-checksummed other network protocols. Both are not to commmon.
-Andi
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