Date: Fri, 25 Aug 95 11:28:02 MDT From: terry@cs.weber.edu (Terry Lambert) To: jkh@time.cdrom.com (Jordan K. Hubbard) Cc: phk@critter.tfs.com, phk@freefall.FreeBSD.org, jgreco@brasil.moneng.mei.com, terryl@CS.Stanford.EDU, freebsd-hackers@freebsd.org Subject: Re: ISDN Anyone? Message-ID: <9508251728.AA11925@cs.weber.edu> In-Reply-To: <20546.809317604@time.cdrom.com> from "Jordan K. Hubbard" at Aug 24, 95 07:26:44 pm
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> > There is actually a lot more promise in a 16550 or 16650 at 460800 bps. > > You only get 1/16th or 1/32th the number of interrupts. > > Hmmm. I find that the serial interrupt overhead is pretty intense at 115.2 > even with a 16550. You know some secret for doing this I don't? That's because it's being done wrong. You take the interrupt and poll like hell in the service routine to handle higher data rates. You can do 115k on a non-FIFO'ed UART using this technique. Terry Lambert terry@cs.weber.edu --- Any opinions in this posting are my own and not those of my present or previous employers.
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