[c-nsp] High CPU Temperature on c7201

[Steve McCrory]

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





This email has been swept by Webroot for viruses. Any files transmitted with it are confidential and intended solely for the email recipient. If you are not the intended recipient please delete this email immediately. Be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this email in error please notify the system administrator. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. Finally, the recipient should check this email and any attachments for the presence of viruses.


GCI Com incorporates the following Group Companies:
GCI Telecom Group Limited Reg. No. 5396496, Edge Telecommunications Ltd Reg. No. 5748740, Edge Telecom Ltd Reg. No. 3101247, IP Infrastructures Ltd Reg. No. 4657026, Invomo Ltd Reg. No. 6267056, NetServices UK Ltd Reg. No. 7118768, WAN Services Ltd Reg. No. 4082862. All Registered in England and Wales, Registered Office: Global House, 2 Crofton Close, Lincoln, LN3 4NT