[c-nsp] High CPU Temperature on c7201

[Matlock, Kenneth L]

What's the aggregate data rate you're seeing?

The 7201 is effectively a 7200 series with an NPE-G2, giving you a TOTAL
aggregate throughput of 1gb/sec. 

Put QoS on it and drop that to 500mb/sec aggregate.

Put Netflow on it and drop that to 250mb/sec aggregate.

Ken Matlock
Network Analyst
303-467-4671
matlockk at exempla.org




-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Steve McCrory
Sent: Wednesday, June 20, 2012 9:22 AM
To: Peter Rathlev
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] High CPU Temperature on c7201

On Wed, 2012-06-20 at 15:54 +0100, Peter Rathlev wrote:

> If the thermal grease has degrade because of age you might see this.
> Dust could be another reason; everything that could obstruct the 
> airflow inside the device. Take a look inside for anomalies.

Hard to tell as it's in a remote PoP. However it was a replacement
chassis for another with a broken fan so I'd have expected it to have
been suitably refurbished from our maintenance supplier

> Same load in packets per second or in bits per second? The former is 
> the real bottleneck.

Both, quite significantly.

Would increasing the hold-queue help? The router is not recording any
'no buffer' drops but has recorded input queue drops

Cheers

Steven

On Wed, 2012-06-20 at 13:07 +0100, Steve McCrory wrote:
> We are having problems with one of our LNS devices dropping packets, 
> albeit in small numbers, due to ignored errors. These are the diags we

> have captured:
> 
> router#sh int g0/1 | i error
>      337 input errors, 0 CRC, 0 frame, 0 overrun, 337 ignored
>      2 output errors, 0 collisions, 1 interface resets
> 
> router#sh controllers g0/1 | i resource
>   rx_crc_error = 0, rx_too_big = 0, rx_resource_error = 337

https://supportforums.cisco.com/docs/DOC-2337

...
> My questions - Could the high CPU Die temperature be attributed to the

> ignored errors we are seeing?

I generally wouldn't think so, but maybe the CPU is throttled because of
the heat.

> What would normally cause high CPU temperature when the ambient 
> temperature recored by the inlet and outlet appears normal?


> For the record, we have other devices of the same model (c7201) 
> performing the same duty with the same IOS and handling a much larger 
> load,

Same load in packets per second or in bits per second? The former is the
real bottleneck.

--
Peter





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