Packet Descriptor Atomic Size and Total Size what does number indicate??

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Highlighted
Cyber Elite

Packet Descriptor Atomic Size and Total Size what does number indicate??

Today we have routing issue that caused the Packet descriptor to go 100 and Caused the max CPU on 5220 to 100.

 

sh running resource-monitor ingress-backlogs  show

 

few sessions using 42/% and 39%.

 

atomic shows 81% total 99

 

I had to clear the sessions quickly to bring these numbers down.

Then we fixed the routing.

 

Need to know what does numbers atomic and Total tell us about packet descriptor.?

 

is total mean total size of packet descriptor available?

atomic means usage?

 

sometimes i see total as low as 81%.

 

 

 

MP

Accepted Solutions
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Community Team Member

I was able to search internally and discovered this about the Atomic meaning.. 

"These terms refer to the type of work queue from which the CPU core picked up the associated packet-processing task.

 

Atomic queues of work must be executed by a single CPU core. Orderable queues of work may be distributed among multiple CPU cores. (The root/etymological meaning of 'atomic' is indivisible (or more literally, non-cuttable)."

 

Total may mean just that, in reference to the entire queue.

 

Stay Secure,
Joe
End of line

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Highlighted
Community Team Member

I was able to search internally and discovered this about the Atomic meaning.. 

"These terms refer to the type of work queue from which the CPU core picked up the associated packet-processing task.

 

Atomic queues of work must be executed by a single CPU core. Orderable queues of work may be distributed among multiple CPU cores. (The root/etymological meaning of 'atomic' is indivisible (or more literally, non-cuttable)."

 

Total may mean just that, in reference to the entire queue.

 

Stay Secure,
Joe
End of line

View solution in original post

Highlighted
Cyber Elite

Hi Joe,

 

Many thanks for getting back to me with the info.

Sometimes only way to learn or get specific information from PA is via Internal channel.

I have seen few times escalation engineers are very good and the info they have is not available to public.

 

Regards

MP

MP
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