210. Power managerment throughput test plan¶

This test plan test cpu frequency changed according io workloads with l3fwd-power sample. The cpu frequency status depends on traffic speed.

210.1. 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"

Let user space can control the CPU frequency:
```
cpupower frequency-set -g userspace
```

210.2. Test Case 1: Check the CPU frequency with high traffic speed¶

Bind one nic port to igb_uio, launch l3fwd-power sample with sacle mode, one core used for one port:

./<build_target>/examples/dpdk-l3fwd-power -c 0x6 -n 1 -- --pmd-mgmt scale --max-empty-poll 128 -p 0x1 -P --config="(0,0,2)"

Send packets by packet generator with high speed, check the cpu frequency it should be equal or below turbo max frequency and be higher than p1.

cat /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq

210.3. Test Case 2: Check the CPU frequency with low traffic speed¶

same as Test Case 1 step 1.
Send packets by packet generator with low speed, check the cpu frequency it should be below p1.

cat /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq