217. Power managerment throughput test plan¶

This test plan test cpu frequence changed according io workloads with l3fwd-power sample. The cpu frequency status depends on NIC and CPU type.

217.1. Prerequisites¶

Update Grub:

Add "intel_pstate=disable" in kernel options.

BIOS configuration as below:

CPU mode : "Power"
Workload configuratuion："IO sensitive"
Hardware Power : "Disabled"
Speedstep : "Enabled"
Turbo : "Enabled"
C-stats：C0/C1
C6 : "Enabled"

217.2. Test Case1: Check the CPU frequency can change according differernt packet speed¶

Check that you are using the “acpi-cpufreq” driver by command “cpufreq-info”.
CPU frequency controlled by userspace by command “cpupower frequency-set -g userspace”.
Bind one nic port to igb_uio, launch l3fwd-power sample, one core used for one port:
```
./l3fwd-power -c 0xc000000 -n 4 -- -P -p 0x01  --config '(0,0,27)'
```
Send packets by packet generator with high speed, check the used cpu frequency is almost 100%:
```
cat /sys/devices/system/cpu/cpu27/cpufreq/cpuinfo_cur_freq
```
Send packets by packet generator with low speed, the CPU frequency will reduce about 50%:
```
cat /sys/devices/system/cpu/cpu27/cpufreq/cpuinfo_cur_freq
```