MQ-Deadline Scheduler Optimized For Much Better Scalability

[phoronix]

Phoronix: MQ-Deadline Scheduler Optimized For Much Better Scalability

Days after delivering a nice boost to Linux I/O performance, Linux storage expert Jens Axboe has tackled another storage-related bottleneck within the kernel...

https://www.phoronix.com/news/MQ-Deadline-Scalability

[NotMine999]

It might not be a "one-liner simple fix" since the code patch is longer than that, but still ... it's nice to see improvements like this.

[Kjell]

Awesome!

[fitzie]

i think something like this went unnoticed for so long because people will just use noop for scheduling on nvme. I use mq-deadline on my sata ssds, and bfq on my spinning rust.

[oibaf]

mq-deadline is the default on my SATA SSD on Ubuntu 23.10:

$ cat /sys/block/sda/queue/scheduler
none [mq-deadline]
​

[S.Pam]

mq-deadline is the default on my SATA SSD on Ubuntu 23.10:

$ cat /sys/block/sda/queue/scheduler
none [mq-deadline]
​

Seems BFQ isn't included by default. A shame, since mq-deadline does not support io prioritisation or cgroups io.weight.

[cobratbq]

Seems BFQ isn't included by default. A shame, since mq-deadline does not support io prioritisation or cgroups io.weight.

It might be a module. Just try and enable it and see if it sticks. If name is bad or module is unavailable, it will not make changes.

echo -n 'bfq' | sudo tee /sys/block/sda/queue/scheduler

[S.Pam]

It might be a module. Just try and enable it and see if it sticks. If name is bad or module is unavailable, it will not make changes.

echo -n 'bfq' | sudo tee /sys/block/sda/queue/scheduler

Yea. Maybe. I don't use Ubuntu much myself and I have BFQ on my systems where suitable. Just meant it in a general sense.

[geearf]

i think something like this went unnoticed for so long because people will just use noop for scheduling on nvme. I use mq-deadline on my sata ssds, and bfq on my spinning rust.

Based on https://github.com/pop-os/default-settings/pull/149 it may be better to use kyber for nvme on desktop.

[S.Pam]

Based on https://github.com/pop-os/default-settings/pull/149 it may be better to use kyber for nvme on desktop.

It seems many like Kyber. Do you know if it supports io weights like BFQ?