Hi James,
It is rate limited. There is a timer in qemu-dm which runs at a rate decided
by the baud rate, and which takes bytes from the virtual FIFO and sends them
on to the "back end" device, so it doesn''t matter if
it''s a pty or a
physical serial port. It would be pretty easy to change this to allow for
theoretically higher speeds, but the result would probably be pretty
disappointing; I did experiment a bit with this when I wrote the 16550A
patch, and if I remember right, at the time you pretty much maxed out at
about ~200kbit. Now, that was a couple of years ago, and the speeds
reachable now might be quite a bit higher, due to CPUs having gotten faster,
as well as VMEXIT being far "lighter" on newer generation CPUs.
Regards,
Trolle
On Sat, Oct 16, 2010 at 9:24 PM, James Harper
<james.harper@bendigoit.com.au> wrote:
> If I specify serial=''pty'' in my config for a HVM domU,
does the baud
> rate that the virtual hardware gets set to actually make a different to
> the throughput or is it not rate limited in any way?
>
> Thanks
>
> James
>
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