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Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

 
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Art Wiens
Respected Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Volker thanks for the other thread ... I don't recall reading that one. I'll try bumping up the LANCP buffers.

The driver is:

image name: "SYS$EIDRIVER"
image file identification: "X-42"
image file build identification: "XA99-0060111012"
link date/time: 3-AUG-2005 15:20:02.50
linker identification: "A11-50"

which looks to be from VMS732_LAN-V0400.

I started with my existing VMS v7.2-2, upgraded to v7.3-2, applied VMS732_UPDATE-V1300 and then the 6 or so patches since.

I'll try the buffers.

Cheers,
Art
Volker Halle
Honored Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Art,

there seem to be data overruns at a rate of 1% of all incoming frames. Is there an extreme amount of multicast/broadcast traffic on the switch ?

Volker.
EdgarZamora
Trusted Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

<< Edgar:
"Is the network heavily utilized? The buffers may need increasing."

It's a busy network and it's in a busy switch, but the ES47 is idle. I look this morning and each interface has ~10,000 data overruns.

Which buffers do you propose increasing? >>

Sorry for delayed response, was stuck in a meeting. I meant the receive buffers:

LANCP> SET/DEFINE DEV /MIN /MAX

Good luck.
Art Wiens
Respected Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

I'm not sure how to confirm or deny that there is an extreme amount of multi-cast traffic. I spoke with the network folks again and they don't seem to think it's excessive.

I have attached the switch port counters ... clean.

Art
Volker Halle
Honored Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Art,

LANCP> SHOW DEV/COUNT will show the counters for the LAN devices. Counters will be shown for total and multicast traffic.

An ES47 should not have problem handling about 30-50 packets/sec - as the switch data seems to show - although they are averaged over 5 minutes, so there could well be spikes.

Volker.
Art Wiens
Respected Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

/min=512 /max=1024 doesn't seem to have done anything.

How high a value is "reasonable"?

Any downside to setting these buffers "very high"?

Art
Volker Halle
Honored Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Art,

try to determine the average incoming packet rate from the LANCP counters. Do the Data overrun counters increase steadily or in bursts ? Try to record the counters every 10 seconds and determine, when they increment.

Specyfing too many buffers would just waste nonpaged pool, if they are not being used.

Volker.

Volker Halle
Honored Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Art,

could you please provide the following counters:

$ MC LANCP SHO DEV/INT/DEBUG

Volker.
Art Wiens
Respected Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Here you go.

BTW, I have logged a call w/HP and I'm working with Tony A. on this issue.

Thanks,
Art
Volker Halle
Honored Contributor

Re: MCR LANCP SHOW DEVICE /ALL /COUNT -> Data overruns

Art,


BTW, I have logged a call w/HP and I'm working with Tony A. on this issue


I know ;-)

Good luck,

Volker.