Min HW Req for 100G PS

# lscpu
CPU(s):                24
On-line CPU(s) list:   0-23
Model name:            Intel(R) Xeon(R) CPU E5-2643 v4 @ 3.40GHz

# cat /proc/cpuinfo | grep processor | wc -l
24

# echo 0 > /sys/devices/system/cpu/cpu{20,21,22,23}/online

# lscpu
CPU(s):                24
On-line CPU(s) list:   0-19
Off-line CPU(s) list:  20-23

# cat /proc/cpuinfo | grep processor | wc -l
20

# echo 1 > /sys/devices/system/cpu/cpu{20,21,22,23}/online

# lscpu
CPU(s):                24
On-line CPU(s) list:   0-23

# cat /sys/devices/system/cpu/smt/active
1

# echo off > /sys/devices/system/cpu/smt/control

# lscpu
CPU(s):                24
On-line CPU(s) list:   0-11
Off-line CPU(s) list:  12-23

# cat /proc/cpuinfo | grep processor | wc -l
12

# echo off > /sys/devices/system/cpu/smt/control

# lscpu
CPU(s):                16
On-line CPU(s) list:   0-15
Off-line CPU(s) list:  8-15
Model name:            Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz
CPU MHz:               1243.188
CPU min MHz:           1200.0000
CPU max MHz:           3300.0000

# cpupower frequency-info
analyzing CPU 0:
  driver: intel_pstate
  hardware limits: 1.20 GHz - 3.30 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 1.20 GHz and 3.30 GHz.
                  The governor "powersave" may decide which speed to use  within this range.
  current CPU frequency: 1.20 GHz (asserted by call to hardware)
  boost state support:
    Supported: yes
    Active: yes
    3200 MHz max turbo 4 active cores
    3200 MHz max turbo 3 active cores
    3300 MHz max turbo 2 active cores
    3300 MHz max turbo 1 active cores

# cpupower frequency-set --governor performance
Setting cpu: 0
Setting cpu: 1
...
Setting cpu: 7

# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor | sort -u
performance

# vi /etc/default/grub
# Append "intel_pstate=disable" to GRUB_CMDLINE_LINUX= option
# update grub via some commands
# reboot

# modprobe cpufreq_userspace
# cpupower frequency-set --governor userspace
# cpupower --cpu all frequency-set --freq 1.5GHz

# ethtool p6p1
Settings for p6p1:
	Supported ports: [ FIBRE ]
    Supported link modes: ... 100000baseCR4/Full

## check NUMA locality
# cat /sys/class/net/p6p1/device/numa_node
0

## if single socket system, no need to be set
# numactl -N 0 iperf3 -s

# watch -n 1 grep MHz /proc/cpuinfo
cpu	MHz									:	1199.960	
...
cpu	MHz									:	3700.000	
...