Public bug reported:
There was a previous request in bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671203 to limit
the IO scheduler to NOOP in linux-azure. The other schedulers were
turned off and NOOP was made the default.
However with new upstream releases, new schedulers where added and
linux-azure inherited the default config value for them from the master
kernel. That's why there are some IO schedulers built as modules in the
extra package (mq-deadline and kyber-iosched). In order to use those two
modules, one needs to install the -extra package and modprobe the
modules first:
# tail /sys/block/sd*/queue/scheduler
==> /sys/block/sda/queue/scheduler <==
[none]
==> /sys/block/sdb/queue/scheduler <==
[none]
# apt install linux-modules-extra-4.15.0-1036-azure
# modprobe kyber-iosched
# tail /sys/block/sd*/queue/scheduler
==> /sys/block/sda/queue/scheduler <==
[none] kyber
==> /sys/block/sdb/queue/scheduler <==
[none] kyber
# modprobe mq-deadline
# tail /sys/block/sd*/queue/scheduler
==> /sys/block/sda/queue/scheduler <==
[none] kyber mq-deadline
==> /sys/block/sdb/queue/scheduler <==
[none] kyber mq-deadline
The schedulers cfq and deadline have been completely disabled in LP bug
#1671203 so they cannot be added with modprobe.
This is a request to move back the cfq and deadline schedulers along
with the mq-deadline and kyber-iosched schedulers to the main linux-
azure package (in other words, not in the -extra package) and allow the
users to be able to modprobe the schedulers when needed.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1813211
Title:
Allow I/O schedulers to be loaded with modprobe in linux-azure
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