Udev: Changing SSD’s default (CFQ) I/O Scheduler
Courtesy of falconindy @ #archlinux
1 2 3 4 5 | # set a larger readahead size ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/read_ahead_kb}="1024" # set deadline scheduler for non-rotating disks ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline" |
To verify:
$ cat /sys/block/sda/queue/scheduler noop [deadline] cfq |
@w0ng – thanks a bunch to both you can falconindy for providing this. I was using the rc.local method before which seemed like something of a hack. But when I switched to systemd, it seemed wrong to have a service file that ran an echo command. This seems like the *right* way to do it.
Thanks for this post – I found it already in the Arch’s Wiki.
Is the “larger readahaed size” required for the deadline/noop scheduler or it is another kind of SSD optimization?
Also, does the rule affect even pendrive, sd cards, etc (as “non rotating disks”)?