BCache Gets New Maintainer, NVMe Improvements & More For Linux 4.15

[phoronix]

Phoronix: BCache Gets New Maintainer, NVMe Improvements & More For Linux 4.15

The changes to the MD RAID and block areas of the Linux kernel have been submitted for the 4.15 cycle...

http://www.phoronix.com/scan.php?page=news_item&px=MD-Block-Changes-Linux-4.15

[cl333r]

A little unrelated, I'm using the stock Ubuntu 17.10 kernel (4.13), how do I enable BFQ and make it default?

[anoother]

When/where was it announced that bcachefs won't be upstreamed?

[starshipeleven]

A little unrelated, I'm using the stock Ubuntu 17.10 kernel (4.13), how do I enable BFQ and make it default?

You need to enable the new i/o schedulers with a kernel command line parameter

scsi_mod.use_blk_mq=1

Then cat /sys/block/sda/queue/scheduler should return "none kyber bfq" as available schedulers

Then you create a udev rule to give bfq to all drives in /etc/udev/rules.d

ACTION=="add|change", SUBSYSTEM=="block", ATTR{queue/scheduler}="bfq"

or use a script that changes scheduler manually as normal echo bfq > /sys/block/sdX/queue/scheduler

Note that you can't use "elevator=bfq" kernel command line, which works for non-blk-mq schedulers.

Done and working on Opensuse Tumbleweed at the times of kernel 4.12.

https://bfq.teambelgium.net/

some more complex udev rules here:

https://forum.antergos.com/topic/7518/how-to-enable-bfq-i-o-scheduler-with-kernel-4-12

[waxhead]

A little unrelated, I'm using the stock Ubuntu 17.10 kernel (4.13), how do I enable BFQ and make it default?

In addition to starshipeleven's comment you may need to run:

'modprobe bfq' as well (at least I had to do that, and I am on Debian Buster.... oh and by the way kyber is loaded by modprobe kyber-iosched)