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Catalyst 3850 - normal to see 30% cpu usage when idle?

wesrobinson
Level 1
Level 1

We have a new stack of two Catalyst 3850-48T's running IOS XE 3.02.00 (we are upgrading to 3.02.01 this weekend.)

We noticed the CPU usage is around 30% even when there is almost no traffic going through the switch.  We haven't seen any indication that it is causing a problem, but is this considered a normal baseline?

I attached my config (with passwords sanitized,) show ver, show controllers utilization, and show process cpu history.

I noticed this behavior is normal on 2900XL/3500XL switches, but I didn't find anything relating it to 3850 switches.  Does the same thing apply to the 3850 switches?

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080094e78.shtml#baseline

Master3850#show processes cpu sorted
Core 0: CPU utilization for five seconds: 29%; one minute: 29%;  five minutes: 30%
Core 1: CPU utilization for five seconds: 28%; one minute: 25%;  five minutes: 26%
Core 2: CPU utilization for five seconds: 25%; one minute: 23%;  five minutes: 23%
Core 3: CPU utilization for five seconds: 23%; one minute: 20%;  five minutes: 21%
PID    Runtime(ms) Invoked  uSecs  5Sec     1Min     5Min     TTY   Process
5497   271470      10207195 219    13.69    12.15    12.68    1088  fed
10566  1515219     59468016 349    10.94    10.13    10.49    34816 iosd
6008   4072745     25063720 50     0.76     0.74     0.71     0     pdsd
5499   2470332     18084094 37     0.47     0.43     0.40     0     stack-mgr
5498   1956222     58269883 107    0.28     0.34     0.33     0     platform_mgr
6034   3708140     3096518  1197   0.14     0.14     0.14     0     cpumemd
43     110950      3525177  31     0.05     0.05     0.04     0     sirq-net-rx/3
52     370         619117   0      0.05     0.03     0.04     0     events/1
1 Accepted Solution

Accepted Solutions

Richard Primm
Cisco Employee
Cisco Employee

Did you turn off all debugs

View solution in original post

3 Replies 3

Richard Primm
Cisco Employee
Cisco Employee

Did you turn off all debugs

After running undebug all (whoops!) and updating to 3.02.01, it went down to more like 15%.

Thanks!

InayathUlla Sharieff
Cisco Employee
Cisco Employee

Hi Wes,

I have seen many customer reporting this. So you can probably assume this to be normal.

Regards

Inayath

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