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From: Celeste Stokely <celeste@stokely.com>
Newsgroups: comp.unix.bsd.netbsd.misc,comp.sys.sun.hardware
Subject: Re: pppd and fifo overrun?
Date: Wed, 24 Jul 1996 07:35:31 -0700
Organization: Stokely Consulting
Lines: 32
Message-ID: <31F634B3.68E9@stokely.com>
References: <4t3js3$a60@elaine39.Stanford.EDU>
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To: "John B. Mooney" <image@leland.Stanford.EDU>
Xref: euryale.cc.adfa.oz.au comp.unix.bsd.netbsd.misc:4150 comp.sys.sun.hardware:37717
John B. Mooney wrote:
>
> I just set up pppd on a sparc 1+ running netbsd 1.1 connected to a US
> Robotics Courier modem. In my system log, I'm consistently getting
> messages like
>
> Jul 23 14:07:41 imajica /netbsd: zs0a: fifo overrun
> Jul 23 14:08:22 imajica last message repeated 59 times
>
> pppd is configured for 38400. It's difficult to make a good connection
> and transfers larger than around 60k time out.
>
> Any suggestions?
My suggestions are:
- Run the connection at a maximum of 19200bps,
- get an external DMA-type serial port card with hw flow control, or
- put this PPP function on a faster cpu.
The Sparc 1+ cpu is having trouble with the interrupts generated by the cpu
serial ports on this 38400bps connection, and can't keep up.
..Celeste Stokely, Unix System Administration Consultant, Stokely Consulting
EMAIL: celeste@stokely.com / Voice: 415-967-6898 / FAX: 415-967-0160
USMAIL: Stokely Consulting/211 Thompson Square/Mountain View CA 94043
URL: http://www.stokely.com/stokely
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Celeste's Tutorials on Solaris 2.x/SunOS 4.1.3+ Modems & Terminals
are available via the Web at http://www.stokely.com/stokely
or via ftp at ftp.batnet.com:/pub/wombats/stokely/ftp
Check out the Web pages for lots of Unix Serial Port & Sysadm Resources!
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