[LU-11913] mq-deadline should be in the list of allowed schedulers

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.1
• Affects Version/s: Lustre 2.13.0, Lustre 2.10.7, Lustre 2.12.1
• Labels: easy
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

The mount.lustre mount process verified that the block device scheduler is using one of the acceptable scheduler types, since using an incorrect scheduler can cause significant performance loss. The currently-allowed schedulers are "noop" and "deadline". With newer kernels, the block multi-queue devices have a new "mq-deadline" scheduler that can also be used, otherwise a message like the following is printed:

onyx-32vm7: mount.lustre: change scheduler of /sys/block/vda/queue/scheduler from mq-deadline to deadline

This isn't strictly harmful (I don't think it will actually accept "deadline" as a valid scheduler in this case), but it is confusing and should be fixed.

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/34426/
Subject: LU-11913 utils: allow "mq-deadline" as scheduler
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: 2fb376ad54c88e90009d1b60293afa0fc29a148c

[Gerrit Updater]

Andreas Dilger ([e-mail]) uploaded a new patch: https://review.whamcloud.com/34426
Subject: LU-11913 utils: allow "mq-deadline" as scheduler
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: 5eb1423327de1ad115fcbeb86f5e2581db317e70

[Peter Jones]

Landed for 2.13

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/34163/
Subject: LU-11913 utils: allow "mq-deadline" as scheduler
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 4326ab53b7142e474c75b46da2361d148a2f7ce8

[Gerrit Updater]

Andreas Dilger ([e-mail]) uploaded a new patch: https://review.whamcloud.com/34163
Subject: LU-11913 utils: allow "mq-deadline" as scheduler
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 0419e70dee48d1c0744eae1c919132c98a7a75ed