From owner-freebsd-stable Wed Jan 20 16:28:04 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA09340 for freebsd-stable-outgoing; Wed, 20 Jan 1999 16:28:04 -0800 (PST) (envelope-from owner-freebsd-stable@FreeBSD.ORG) Received: from nhj.nlc.net.au (nhj.nlc.net.au [203.24.133.1]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id QAA09327 for ; Wed, 20 Jan 1999 16:28:01 -0800 (PST) (envelope-from john.saunders@nlc.net.au) Received: (qmail 2281 invoked by uid 1000); 21 Jan 1999 11:27:47 +1100 From: "John Saunders" Date: Thu, 21 Jan 1999 11:27:47 +1100 (EST) To: Wes Peters cc: Ruslan Ermilov , freebsd-stable@FreeBSD.ORG Subject: Re: Kernel PPP tty-level buffer overflows In-Reply-To: <36A60EF7.53A03129@softweyr.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wed, 20 Jan 1999, Wes Peters wrote: > > > > > sio0: 815 more tty-level buffer overflows (total 4715) > > > > > sio0: 3093 more tty-level buffer overflows (total 7808) > > Read the sio(4) manpage, section ``BUGS''. > > Try to lower down your port's baud rate, say to 57600bps. > > Or get a 16650 or 16750 based card. I have a dual 16C650 card > in my dial-in server, running two Impact IQ ISDN adapters at > 115,200 bps, and have had no problems whatsoever. One of these > days I'm going to figure out how to crank them up to 230,400 > bps. It's got nothing to do with the UART, a 16550A can run all day at 115200 under FreeBSD. If the problem was the UART then the error would be "silo overflow". The problem is that the the tty driver is delivering data too quickly for PPP to handle. I'm still convinved that a larger buffer may help, this needs some investigation. The machine is a Pentium 120 with 64MB of RAM, so it's not exactly slow, and it's not swapping. So if it can manage to keep a 10Mbps ethernet saturated why is it having problems with a 115200 com port? And when I'm not FTP'ing stuff to it the ethernet is running around 7% utilization. Anyway running 57600 seems to cure the problem. Cheers. -- +------------------------------------------------------------+ . | John Saunders - mailto:john@nlc.net.au (EMail) | ,--_|\ | - http://www.nlc.net.au/ (WWW) | / Oz \ | - 02-9489-4932 or 041-822-3814 (Phone) | \_,--\_/ | NHJ NORTHLINK COMMUNICATIONS - Supplying a professional, | v | and above all friendly, internet connection service. | +------------------------------------------------------------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message