Malinux' notes

Disable NCQ

Disabling NCQ (Native Command Queuing) can in some circumstances improve performance

# To check if ncq is already off, its' likely not if you haven't already turned it off
cat /sys/block/sdX/device/queue_depth
# it will return 32 if it's on and 1 if it's turned off
# To turn it off:
echo 1 > /sys/block/sdX/device/queue_depth

To have this survive a reboot and work for all your hdd's or ssd's we can make a systemd script First we make a bash script that the systemd script run

#!/bin/bash
disker=$( lsblk -d | awk '/^sd/ { print $1 }' )
# echo $disker

for disk in $disker
do
    q="/sys/block/$disk/device/queue_depth";
    newq=1;
    echo $newq > $q;
done

Put the script in /usr/local/bin/disable_ncq.sh and make it executable

chmod +x /usr/local/bin/disable_ncq.sh

Then we go on to make the systemd script itself.

Create /etc/systemd/system/disable-ncq.service and add:

# vim:isfname-==
[Unit]
Description=HDD queuing

[Service]
Type=oneshot
ExecStart=/usr/local/bin/disable_ncq.sh

[Install]
WantedBy=multi-user.target

Then we need to enable and start the script:

systemctl enable disable-ncq.sh
systemctl start disable-ncq.sh

===BFQ I/O scheduler I use BFQ btw. BFQ is a bloody fast I/O scheduler, best suitable with HDD's. source: https://wiki.archlinux.org/title/Improving_performance#Changing_I/O_scheduler