Re: (PM) "W1 DMA: Recieve Buffer Full"

Chris Adams (cadams@ro.com)
Sun, 4 Apr 1999 15:10:58 -0500

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.

> > 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?

> > 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.

-- 
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.
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