Date: Thu, 06 Feb 1997 18:07:16 -0800 From: Julian Elischer <julian@whistle.com> To: Paul Traina <pst@jnx.com> Cc: Bruce Evans <bde@zeta.org.au>, hackers@freebsd.org, bde@freebsd.org Subject: Re: serial ports at 230k Message-ID: <32FA8E54.FF6D5DF@whistle.com> References: <199702062052.MAA00639@base.jnx.com>
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Paul Traina wrote: > > Good guess, but I'm actually trying out a 3COM ISDN TA that runs at 230k. > > From: Bruce Evans <bde@zeta.org.au> > Subject: Re: serial ports at 230k > >Does anyone have any experience with running 16550A's at 230kbps under FreeB > >>SD? > >Yes, I know, the driver doesn't support it currently, but has anyone played? > > Not me. I checked the PC16550D specs recently. The maximum speed is > 1.5Mbps like I remembered. > > If you only care about remote gdb throughput to an sio port on a > FreeBSD host, note that the protocol is non-streaming so it is limited > to 1 packet per clock tick (30Kbps effective throughput at best) by the > host's pseudo-DMA timeout routine. > > Bruce exactly why I was looking at it (3COM impact)
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