Date: Mon, 7 Jun 1999 23:23:57 +0100 From: Mark Ovens <markov@globalnet.co.uk> To: Doug Jennings <dougj@netdoor.com> Cc: "James R. Shrenk" <dionysos3@crosswinds.net>, freebsd-questions@FreeBSD.ORG Subject: Re: silo overflow errors Message-ID: <19990607232356.E255@marder-1> In-Reply-To: <000c01beb133$a2d3f1c0$27c194d0@compuschmam>; from Doug Jennings on Mon, Jun 07, 1999 at 05:17:53PM -0500 References: <000c01beb133$a2d3f1c0$27c194d0@compuschmam>
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On Mon, Jun 07, 1999 at 05:17:53PM -0500, Doug Jennings wrote:
> When I get the output of dmesg, it contains the following lines:
>
> sio0 at 0x3f8-0x3ff irq 4 flags 0x10 on isa
> sio0: type 16550A
>
> I knew it had to be a 16550A UART because the computer is brand new with all
> the appropriate bells / whistles / et cetera. Argh. I suppose I will see
> if I can slow down the modem now.
>
> One more question...do you think the problem is happening inside the modem
> itself? Or could it be caused by some kind of interference in my serial
> cable?
It would be worth checking the shield on your cable, especially if
it runs parallel to the mains lead. I've seen silo overflow errors
generated at the rate of >50 per second on a Sun with serial lines
to terminals running through a factory close to arc welders :-)
> I am obviously grasping here, but I just can't figure out why I am
> having silo errors with such a supposedly good modem (external courier
> v.everything 28800).
>
> >What is your dmesg output? It looks like you might have a older UART
> >(8250 maybe?) If that's the case, you might try slowing the modem down to
> >14400 and see if that doesn't help.
> >
> >
> >On Mon, 7 Jun 1999, Doug Jennings wrote:
> >
> >>
> >> After finally getting user ppp to work, I keep running into the
> >> following problem. Once I establish a ppp connection and I try to
> >> send/receive any data whatsoever (for example, opening a telnet
> session), I
> >> get the message:
> >>
> >> /kernel: sio0: 1 more silo overflow (total 1)
> >>
> >> The 'total' goes up each time I send/receive any data (for example, if I
> >> issue a "ls" command in the telnet session and have to receive the output
> of
> >> that). It slows down my 28800 modem to an absolute crawl.
> >>
> >> Any ideas on a fix for this? I am running a fresh installation of FreeBSD
> >> 3.1 and I am using an external USR v.everything courier modem. I know
> that
> >> it has to do with some buffering issue -- I just don't know how to fix
> it.
> >>
> >> Any ideas would be appreciated.
> >>
> >> Thanks,
> >>
> >> -Doug
>
>
>
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--
FreeBSD - The Power To Serve http://www.freebsd.org
My Webpage http://www.users.globalnet.co.uk/~markov
_______________________________________________________________
Mark Ovens, CNC Apps Engineer, Radan Computational Ltd. Bath UK
CAD/CAM solutions for Sheetmetal Working Industry
mailto:marko@uk.radan.com http://www.radan.com
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