Messages in this thread | | | Subject | Re: zero-copy TCP fileserving | Date | Thu, 3 Jun 1999 18:45:38 +0100 (BST) | From | Alan Cox <> |
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> Something like: > > (1) A checksum of zero means don't check the checksum. > (2) You can't route a zero-checksum IP packet. If you route it, > you must checksum it before routing.
LAN CRC's aren't sufficient. They protect card->card not host->host. And the world _does_ see host->host errors. Also IP checksums are cheap, even in silicon
> This would allow LANs to operate at higher speeds where a hardware CRC > makes sure the data is good anyway, while maintaining compatibility
It would make no difference. The cost nowdays is the cost per packet big time. Going to bigger packets is a huge win. The checksum helps but not that much.
There are also people researching using FPGA's to do hardware assisted IP handling (eg hardware TCP demux)
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