2025-5-13--1-41-AM HV Optimization Script Snapshot




#!/bin/bash
echo "`date` Setting the linux kernel's dirty page writeback to use CPU 0" >> /var/log/syslog
echo 1 > /sys/bus/workqueue/devices/writeback/cpumask
cat /sys/bus/workqueue/devices/writeback/cpumask
echo 1 > /sys/devices/virtual/workqueue/cpumask
cat /sys/devices/virtual/workqueue/cpumask
echo "`date` Workqeue is now set to CPU 0" >> /var/log/syslog
echo "`date` Setting vm.stat_interval to 120" >> /var/log/syslog
sysctl -w vm.stat_interval=1
echo "`date` Success" >> /var/log/syslog
sysctl -w vm.swappiness=60
echo "`date` Swappiness set to 60" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for NGINX..." >> /var/log/syslog
pgrep nginx | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` NGINX CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for emhttpd..." >> /var/log/syslog
pgrep emhttpd | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` emhttpd CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for php..." >> /var/log/syslog
pgrep php | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` PHP CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for php-fpm..." >> /var/log/syslog
pgrep php-fpm | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` PHP-FPM CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for udevd..." >> /var/log/syslog
pgrep udevd | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` udevd CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for avahi..." >> /var/log/syslog
pgrep avahi | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,66-69 $int
done
echo "`date` avahi CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Reassigning CPU Affinity for libvirtd..." >> /var/log/syslog
pgrep libvirtd | cut -d: -f1 | tr -d ' ' | while read int; do
  taskset -cp 0-3,44-47,22-25,65-68 $int
done
echo "`date` libvirtd CPU Affinity is now 0-3,44-47,22-25,66-69" >> /var/log/syslog
echo "`date` Disabling MachineCheck..." >> /var/log/syslog
echo 0 > /sys/devices/system/machinecheck/machinecheck0/check_interval
echo "`date` MachineCheck disabled sucessfully" >> /var/log/syslog
echo "`date` Disabling NUMA Balancing at Kernel level..." >> /var/log/syslog
sysctl -w kernel.numa_balancing=0
echo "`date` Success" >> /var/log/syslog
echo "`date` Disabling timer migration" >> /var/log/syslog
echo 0 > /proc/sys/kernel/timer_migration
echo "`date` Success" >> /var/log/syslog
cat /proc/sys/kernel/timer_migration
echo "`date` Dsabling KSM" >> /var/log/syslog
echo 0 > /sys/kernel/mm/ksm/run
echo 0 > /sys/kernel/mm/ksm/merge_across_nodes
echo "`date` KSM is disabled, this feature is completely useless" >> /var/log/syslog
echo "`date` Setting kernel scheduler values (Will favor latency)"
ulimit -r 99
sysctl -w kernel.sched_rt_runtime_us=-1
cat /proc/sys/kernel/sched_rt_runtime_us
#ysctl -w kernel.sched_min_granularity_ns=10000000
#sysctl -w kernel.sched_wakeup_granularity_ns=15000000
echo "`date` Disabling split lock mitigation" >> /var/log/syslog
sysctl -w kernel.split_lock_mitigate=0
echo "`date` Success" >> /var/log/syslog