Re: zero-copy TCP fileserving

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 3 Jun 1999 18:04:22 +0100 (BST)

> But in the case of a heavy filetransfer, the data will need to hit main
> memory, especially if the NIC can bus-master DMA from main memory. The

> DMA in, DMA out. Checksum can be handled by the NIC. Now I'm not mad
> enough to claim that direct device<->device I/O is the way to go (which
> was discussed here recently :).

If the hardware can do checksum on outgoing for you, you are absolutely
correct. But not many do.

Alan

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