[c-nsp] 6509 w/SUP720-3BXL and high CPU load

[Lee Starnes]

Hello,

We are seeing on one of our 6509 chassis high CPU load (50-90%). We are not
seeing this on our other chassis and they are all optioned the same. The
one difference is that this chassis is sending traffic on one incoming
10gig interface out to another 6509 where that traffic is destine to hit
its gateway and then out to the internet.

Simple diagram is below.

10G serverB - 6509b - 6509a - asr9000 - internet
10G serverA - 6509a - asr9000 - internet

While I know this is not ideal, it is what it is until B server can get
moved to a different vlan. The issue is that 6509b has got high CPU load of
50-90% while 6509a has CPU load of 4%.

Traffic from server B is about 4.8G and traffic from server B is about 5G.

I have gone through the troubleshooting high CPU load on sup720 document
here:
https://community.cisco.com/t5/networking-documents/troubleshooting-high-cpu-on-a-6500-with-sup720/ta-p/3126932

and every time I find something that give me that Ah-ha moment, I check it
on the other switch and see that it is the same or higher as to ACL usage
or other items.

So my question is, what is the best way to track down what this high CPU
load is?

CPU on 6509b: CPU utilization for five seconds: 62%/22%; one minute: 42%;
five minutes: 42%
CPU on 6509a: CPU utilization for five seconds: 3%/1%; one minute: 14%;
five minutes: 14%

Any help would be greatly appreciated. Pulling my hair out trying to figure
out why.

Thanks,

-Lee