Date: Wed, 1 Apr 1998 12:16:29 +0200 (METDST) From: hm@hcs.de (Hellmuth Michaelis) To: freebsd-isdn@FreeBSD.ORG (ISDN Mailinglist) Subject: Re: i4b-L1-F_ill:What is this? Message-ID: <m0yKKZK-0000dVC@hcswork.hcs.de> In-Reply-To: <199804010942.LAA22292@rvc1.informatik.ba-stuttgart.de> from Wolfgang Helbig at "Apr 1, 98 11:42:35 am"
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>From the keyboard of Wolfgang Helbig:
> > >From the keyboard of Gary Jennejohn:
> >
> > > >> xxx_ISAC_IRQ..: RME: Input Buffer Overflow...
> > >
> > > I see exactly the same thing with a Teles 16.3 card when I boot and _before_
> > > isdnd starts. Once the daemon is running the messages disappear.
> >
> > Hmm - Gary, i remember we found out that you have got a constant-active
> > ("daueraktiv" in german, don't know the english word) S0 bus, perhaps
> > this is the cause ?!
>
> According to Q.921 5.9.3 the max size of the information field is
> 260 bytes. Add four bytes (2 bytes address and 2 bytes control)
> and you end up with a max size of a D frame of 264 bytes.
This is true, but under "normal" circumstances messages are not longer
than ~64 bytes.
What i was trying to say was: You get an input buffer overflow in case
the ISAC irqs are not serviced, which is the case while booting.
I don't see this messages, because my S0 bus is quiet during boot.
Now _if_ you have an S0 bus which is "daueraktiv"/constantly-active (which
is configurable in the exchange) _then_ you have activity going on at boot
time where the irq's are not serviced and then the possibility exists, that
you get such messages.
And, what i know from private conversation with Gary, is, that he seems
to have such a constantly-active S0 bus.
I have no explanation for the phenomenon that Gary gets the messages until
he starts the isdnd.
hellmuth
--
Hellmuth Michaelis Tel +49 40 559747-70
HCS Hanseatischer Computerservice GmbH Fax +49 40 559747-77
Oldesloer Strasse 97-99 Mail hm@hcs.de
22457 Hamburg WWW http://www.hcs.de
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