Hi this explains FED an

Wes Neary · ‎08-10-2015

Good Morning All,

Am currently looking into high cpu figures on one of our 3850 switches the model is WS-C3850-24P running 03.02.03.SE. we had an alert through for a sustained period of high cpu usage, upon investigation we observed the following.

#sh proc cpu sort | e 0.00
Core 0: CPU utilization for five seconds: 58%; one minute: 59%;  five minutes: 67%
Core 1: CPU utilization for five seconds: 99%; one minute: 81%;  five minutes: 75%
Core 2: CPU utilization for five seconds: 66%; one minute: 80%;  five minutes: 83%
Core 3: CPU utilization for five seconds: 100%; one minute: 99%;  five minutes: 97%
PID    Runtime(ms) Invoked  uSecs  5Sec     1Min     5Min     TTY   Process
5624   2479771     22418540 822    79.54    78.61    78.64    1088  fed
9218   3942324     28163912 175    0.88     0.95     1.38     0     iosd
5625   3917259     26073687 19     0.15     0.13     0.14     0     platform_mgr
6288   3640666     78478057 1195   0.15     0.15     0.15     0     cpumemd
5319   2506952     77021906 88     0.10     0.02     0.03     0     system_mgr
5626   2054673     55371158 42     0.05     0.05     0.05     0     stack-mgr
6118   2523710     31051664 81     0.05     0.02     0.05     0     idope.py
6274   955400      63186867 15     0.05     0.01     0.03     0     system_mgr_cli
6277   3283605     25505456 29     0.05     0.03     0.04     0     pdsd
6282   2035562     77003566 82     0.05     0.01     0.03     0     mem_mgmt

Obviously the fed process seems to be the culprit, upon further probing this was the result

#sh processes cpu detailed process fed sorted 1min | e 0.00
Core 0: CPU utilization for five seconds: 78%; one minute: 82%; five minutes: 78%
Core 1: CPU utilization for five seconds: 44%; one minute: 73%; five minutes: 74%
Core 2: CPU utilization for five seconds: 99%; one minute: 96%; five minutes: 89%
Core 3: CPU utilization for five seconds: 99%; one minute: 72%; five minutes: 83%
PID    T C  TID    Runtime(ms) Invoked uSecs  5Sec      1Min     5Min     TTY   Process
                                               (%)       (%)      (%)
5624   L           3921121     2242961 822    78.75     79.03   78.96   1088  fed
5624   L 3  9868   2867420     1477756 0      24.85     24.75   24.75   0     Replenish
5624   L 2  9870   1259297     1585013 0      24.80     24.74   24.73   0     PunjectRx
5624   L 0  6081   2246478     3162559 0      23.72     23.80   23.74   0     fed-ots-nfl
5624   L 0  6065   2252465     5139954 0      4.63      5.19    5.21    1088  fed
5624   L 1  6078   1504013     3270667 0      0.34      0.22    0.21    0     fed-ots-main
5624   L 1  9851   4077914     3650293 0      0.25      0.20    0.20    0     Xcvr
5624   L 1  6085   2344196     6685688 0      0.15      0.04    0.05    0     Timer

I tried Google to find out what the Replenish, PunjectRx and fed-ots-main are or likely causes but didn't really find anything. Does anyone know what function these process control or a likely cause?

Thanks in advance

Wes

Mark Malone · ‎08-10-2015

Hi this explains FED an iosd

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/117594-technote-hicpu3850-00.html

Forwarding Engine Driver (FED): This is the heart of the Cisco Catalyst 3850 Series Switch and is responsible for all hardware programming/forwarding.

IOSd: This is the Cisco IOS daemon that runs on the Linux kernel. It is run as a software process within the kernel.

Does anyone know what these 3850 process are?