On 05/14/2016 08:49 AM, [email protected] wrote:
> That's right, I forgot about start/stop bits. 
> 
> Do 4.x kernels still have this limitation? 

A quick i/o test on 4.6.0-rc7 showed no difference in throughput
between 4096-byte reads and 68-byte reads @ 1.5Mbaud in raw mode.

Both averaged around 144Kchars/sec, or 96% b/w saturation, on
a not loaded BBB.

NB: the i/o test ran on a single BBB with uart4 sender
to uart5 receiver. IOW, I would expect similar results at
full-duplex.

Regards,
Peter Hurley

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