> Once upon a time, Tom <tom@sdf.com> said:
> > On Sat, 3 Apr 1999, Chris Adams wrote:
> > > I get lots of "W1 DMA: Recieve Buffer Full" messages on my OR-HS (one
> > > every couple of seconds). I've looked at the archives and people have
> > > said that usually means your network is congested.
> > >
> > > I know that isn't the case because the OR-HS and the device all of the
> > > traffic is going to are on a 3Com switch. It is a fairly busy switch,
> > > and the OR-HS does see about a 1% collision rate.
> >
> > The W1 "receive" buffer full message is telling you that it isn't the
> > ethernet.
>
> Well, what I've read in the past is that when the ethernet is congested,
> the packets don't get out of the W1 receive buffer fast enough and the
> buffer fills up.
That would be very odd. How can the OR-HS know the packets from W1 are
even to go out via the ethernet until they have been routed first?
Once they have been processed, they should be sitting in the ethernet
output queue. If the ethernet gets too busy, the ethernet output queue
should be the one to drop packets.
> > > This T1 is pretty much saturated (runs at around 80% average usually) -
> > > can a OR-HS not really keep up with that much traffic?
> >
> > Possibly. Do you have filters? OSPF? SNMP? RIP?
>
> Nope. No filters, OSPF, RIP, etc. The only thing remotely strange is
> that it is an unnumbered interface. Could that affect things?
Who knows?
> > > The other end of the link is a Cisco 7513, and it sends LCP_ECHO
> > > requests every ten seconds. Sometimes though, I get bursts of
> >
> > Turning off LCP echo-requests will reduce load a bit. PPP LCP
> > echo-requests are of a dubious value on many connections.
>
> Yeah, I am thinking about having the other end just turn off echo
> requests.
>
> > > PPP recv(W1): Invalid header
> >
> > Again corrupted packet. Sometimes this kind of stuff "just happens".
>
> But that shouldn't "just happen" on a clean digital line unless the
> router on one end or the other is screwing up.
That is pretty funny. All digital lines that I see around here have
some kind of measurable error rate. It may be as low as one error per
day, but they all do. The telco will probably declare any line with less
than one error per hour as perfectly clean, mostly because they don't test
long enough to see them.
The OR-HS is a dead product. Throw it away and get a Cisco 2501. That
is what I did. At least the RAM is expandable, and it keeps lots of cool
stats too.
> --
> Chris Adams <cadams@ro.com> - System Administrator
> Renaissance Internet Services - IBS Interactive, Inc.
> Home: http://ro.com/~cadams - Public key: http://ro.com/~cadams/pubkey.txt
> I don't speak for anybody but myself - that's enough trouble.
Tom
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