I wrote:
> With spi_gpio, it's
> 4.2 Mbps. The theoretical maximum the transceiver allows would
> be 6.76 Mbps.

Ah, that also includes a few copies in the networking stack,
including crossing the kernel to user space boundary for dirtpan
and for ping.

Memory copies are fast, though. Shouldn't affect this calculation
by more than a few percent.

- Werner

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