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Date:      Sun, 19 Sep 1999 09:31:18 -0700
From:      Kent Stewart <kstewart@3-cities.com>
To:        wwoods@cybcon.com
Cc:        freebsd-alpha@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG
Subject:   Re: Silo Overflows on Alpha......
Message-ID:  <37E50FD6.C0159835@3-cities.com>
References:  <XFMail.990919045844.wwoods@cybcon.com>

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I don't have an Alpha but on a PC this isn't a usually an OS problem.
It is most often a uart problem. It happens when you have an external
moden connected to a com port running to 16450 or less uart. If you
have a 16550Afn or modern equivalent, then you have to up the fifo
count where the interrupts occur to 14. The internal modems have the
equivalent of a 16550 built in and don't have the problem for that
reason. Somewhere above 9600, the interupt latency is such that the
system can't respond and you get an overflow. My PC has the equivalent
of a 16550 built onto the motherboard and the connection to the
external modem is at 115,200 baud. This will handle a 56kb modem. You
are supposed to have the DTE rate set to 4 times the DCE rate but
115,200 is as high as it goes on my computers.

Kent

William Woods wrote:
> 
> I have an Alphastation 200 4/233 running 3.2-R (I am TRYING to cvsup to
> 3.3-Stable) and I keep getting silo overflows when connected to the net with an
> external modem at anything over 9600.
> 
> The exact messages are:
> 
> Sep 17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 300)
>     17 22:10:45 alpha /kerne;: sio0: 1 more silo overflow (total 301)
>     17 22:11:15 alpha /kerne;: sio0: 1 more silo overflow (total 302)
>     17 22:11:30 alpha /kerne;: sio0: 1 more silo overflow (total 303)
>     17 22:11:45 alpha /kerne;: sio0: 1 more silo overflow (total 304)
>     17 22:12:00 alpha /kerne;: sio0: 1 more silo overflow (total 305)
>     17 22:12:15 alpha /kerne;: sio0: 1 more silo overflow (total 306)
>     17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 307)
>     17 22:10:30 alpha /kerne;: sio0: 1 more silo overflow (total 308)
> 
> etc.........
> 
> I know I had this problem about 5 months ago, then I dident use the Alpha for a
> while. Now I am HOPEING that this is somewhat fixed in 3.3 (If I can ever cvsup
> the sources, I will find out).
> 
> Can anyone shed some light on this...
> 
> ----------------------------------
> E-Mail: William Woods <wwoods@cybcon.com>
> Date: 18-Sep-99
> Time: 22:37:32
> This message was sent by XFMail
> ---
> 
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-- 
Kent Stewart
Richland, WA

mailto:kstewart@3-cities.com
http://www.3-cities.com/~kstewart/index.html

SETI (Search for Extraterrestrial Intelligence) @ Home
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