Latency, error finishing read, and IRQ affinity

mozmck wrote:

It should be run from /etc/rc.local and not as a policyscript for irqbalance.

$ sudo nano /etc/default/grub

    #GRUB_CMDLINE_LINUX_DEFAULT="quiet"
    GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1"

$ sudo update-grub
$ sudo nano /etc/rc.local
-----------------------------------------------------
    #!/bin/sh -e
    #
    # IRQ Affinity by mozmck
    sh '/etc/irqbalance.d/lcnc_irqpolicy.sh'
    exit 0
-----------------------------------------------------
$ sudo chmod +x /etc/rc.local
$ sudo systemctl daemon-reload
$ sudo systemctl status rc-local

tommylight wrote:

Made this sticky, thank you.

mozmck wrote:

I haven't tested it myself yet, but I know I have a dual-core or two around here that I can try it on. Probably be next week or so before I can find time to do that.
 

Ekholm wrote:

I got the error in the picture. can't find folder

$ sudo apt update && sudo apt upgrade
$ sudo apt install irqbalance
$ sudo ./rt_setup
​​​​​​​

mozmck wrote:

Something like this should work:

#!/bin/bash
MASK=$( printf "%X" $((1<<`lscpu -e=CPU | tail -1`)) )
NIC=`awk 'BEGIN{nic=""} {if ($1=="iface") {tmpnic = $2} if ($1=="address") {if ($2 == 10.10.10.1) {nic = tmpnic}}} END{print(nic)}' /etc/network/interfaces`

if [ "$NIC" != "" ]; then
    grep $NIC /proc/interrupts | cut -d ":" -f 1 | while read -r IRQ; do
        echo $MASK > /proc/irq/$IRQ/smp_affinity
    done
fi
exit 0"