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When running the display cpu-usage command, customer can see 2 CPU, 1 working and the other at 0% usage, they want to know why is this.
Customer is doing some test with AR1220E. They are stressing the device to the limit but when they checked CPU-Usage they realize it looks AR1220E has 2 CPU´s so they ask how to stress both CPU´s.
First we need to confirm if AR1220E has 2 CPU´s and if those CPU´s are for Data Plane and if yes, how the costumer can stress both CPU´s for the test.
This is what they got by display cpu-usage:
CPU Usage Stat. Cycle: 10 (Second)
CPU Usage Stat. Time : 2016-06-24 15:29:08
CPU Usage: 7.7% Max: 44.2%
User: 3.0% System: 3.3% SoftIrq: 0.2% HardIrq: 1.0% Idle: 92.3%
CPU utilization for ten seconds: 7.7% one minute: 7.0% five minutes: 6.0% .
CPU Usage: 100% Max: 100%
CPU utilization for ten seconds: 100% one minute: 66.8% five minutes: 52.8% .
PID ProcessName CPU% CoreIndex Runtime State
267 cap32ar1220e 100% CPU1 331345030 R <---------------------------------------------
266 main_task 7.6% CPU0 43073462 S
191 k3gdevd 0.0% CPU0 2106 D
12 sync_supers 0.0% CPU0 1480 S
265 cap32ar1220e 0.0% CPU0 1239 S<---------------------------------------------
1 init 0.0% CPU0 442 S
30 mtdblockd 0.0% CPU0 57 S
130 loop0 0.0% CPU0 34 S
AR1220E has 2 CPU, and one CPU (CPU 0) belongs to Control Plane，another CPU (CPU1) is for Data Plane.
How to Test:
1. Control Plane’ CPU (CPU 0): To enable business functions as much as possible.
For example, search information by SNMP Manager (U2000/eSight), get big files from AR by FTP.
2. Data Plane’ CPU (CPU 1): push heavy traffic to AR1220E by tester device.
Why the same task “cap32ar1220e ” exists on two CPU?
The “cap32ar1220e ” on Data Plane’ CPU (CPU 1) is Real and effective,
and “cap32ar1220e ” on Control Plane’ CPU (CPU 0) is a mirror task, there is no real effect.