[VERIFICATION BIONIC] I can modprobe the mq-deadline, kyber and bfq schedulers but it looks like doing a modprobe of the cfq and deadline schedulers doesn't list them as choices in the available schedulers:
# uname -r 4.18.0-1009-azure # modprobe bfq # modprobe cfq-iosched # modprobe mq-deadline # modprobe kyber-iosched # modprobe deadline-iosched # tail /sys/block/sda/queue/scheduler [none] mq-deadline kyber bfq I have these 4.18 kernel packages installed: # dpkg -l | grep 4.18 | grep linux ii linux-azure 4.18.0.1009.9 ii linux-azure-cloud-tools-4.18.0-1009 4.18.0-1009.9~18.04.1 ii linux-azure-headers-4.18.0-1009 4.18.0-1009.9~18.04.1 ii linux-azure-tools-4.18.0-1009 4.18.0-1009.9~18.04.1 ii linux-cloud-tools-4.18.0-1009-azure 4.18.0-1009.9~18.04.1 ii linux-cloud-tools-azure 4.18.0.1009.9 ii linux-headers-4.18.0-1009-azure 4.18.0-1009.9~18.04.1 ii linux-headers-azure 4.18.0.1009.9 ii linux-image-4.18.0-1009-azure 4.18.0-1009.9~18.04.1 ii linux-image-azure 4.18.0.1009.9 ii linux-modules-4.18.0-1009-azure 4.18.0-1009.9~18.04.1 ii linux-tools-4.18.0-1009-azure 4.18.0-1009.9~18.04.1 ii linux-tools-azure 4.18.0.1009.9 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1813211 Title: Allow I/O schedulers to be loaded with modprobe in linux-azure Status in linux-azure package in Ubuntu: Invalid Status in linux-azure source package in Bionic: Fix Committed Status in linux-azure source package in Cosmic: Fix Committed Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1813211/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
