For example: my biggest challenge with the e1000 was just hacking up the DMA setup path - i seem to get better numbers if i dont kick the DMA until i stash all the packets on the ring first etc. It seemed counter-intuitive.
That seems to make sense. The rings are(?) in system memory and you can write to them faster. Kicking the DMA needs a transaction on the PCI bus, which can be painfully slow...
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