isolate CPU cores
find your physical and virtual cores
lscpu --all --extended
Isolate the cores (numbers are all virtual cores bound to a physical)
sudo gedit /etc/default/grub
Find and modify : GRUB_CMDLINE_LINUX="isolcpus=1,3 nohz_full=1,3"
save and update Grub:
sudo update-grub
Assign IRQ to CPU. NOTE: need to be done after every reboot.
Find IRQ for enp1s0
grep enp1s0 /proc/interrupts
sudo ip link set enp1s0 down
sudo ip link set enp1s0 up
Monitor NIC: packetloss and memmory usage
watch -n0 tc -s qdisc show dev enp1s0
Monitor CPU and interupts > search for enp1s0
watch -n0 cat /proc/interrupts
Validate settings:
are the selected cores isolated:
cat /sys/devices/system/cpu/isolated
is the NIC bound to a specific core
cat /proc/irq/126/smp_affinity
research:
Do we need to stop the irqbalance service? stop when needed
sudo service irqbalance statussudo service irqbalance stop
research values under cat /sys/class/net/enp1s0/queues/tx-0/
work in progress:
isolate CPU cores find your physical and virtual cores
lscpu --all --extendedIsolate the cores (numbers are all virtual cores bound to a physical)
sudo gedit /etc/default/grubFind and modify : GRUB_CMDLINE_LINUX="isolcpus=1,3 nohz_full=1,3" save and update Grub:sudo update-grubAssign IRQ to CPU. NOTE: need to be done after every reboot. Find IRQ for enp1s0
grep enp1s0 /proc/interruptsBind IRQ to CPU core
echo 2 > /proc/irq/126/smp_affinitymore info about binding to CPU https://support.hpe.com/hpesc/public/docDisplay?docId=c01824714&docLocale=en_USStop and start the nic:
Monitor NIC: packetloss and memmory usage
watch -n0 tc -s qdisc show dev enp1s0Monitor CPU and interupts > search for enp1s0watch -n0 cat /proc/interruptsValidate settings: are the selected cores isolated:
cat /sys/devices/system/cpu/isolatedis the NIC bound to a specific corecat /proc/irq/126/smp_affinityresearch:
Do we need to stop the irqbalance service? stop when needed
sudo service irqbalance statussudo service irqbalance stopresearch values under cat /sys/class/net/enp1s0/queues/tx-0/