> > This is a bug in cdc-acm really. It should not double buffer, but to be
> > fair to the authors prior to the new tty buffering it *had* to do this.
>
> I assume this applies to all serial drivers in the wider sense?
When possible at least. Obviously there will always be some buffering in
the hardware or interface glue but you should never need to work around
the tty buffers now.
Alan
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