Yesterday Suse issued an s390-tools patch for SLES 12SP5 that does this:
* Changing the scheduler from "deadline" to the newly created "mq-deadline"
scheduler (bsc#1176574)
(It takes us to 2.1.0-18.26.1 in case anyone's counting.)
So two questions. First, it looks to me like mq-deadline is already there:
$ rpm -q s390-tools
s390-tools-2.1.0-18.23.1.s390x
$ cat /sys/block/dasda/queue/scheduler
[none] mq-deadline kyber bfq
so what does the patch do? Second, how does the choice affect performance on
DASD devices? Does one even have a choice or does the device driver allow only
mq-deadline?
(There's an even newer s390-tools patch for SLES 12SP5 that fixes two other
things, and gets one to 18.29.1.)
Thank you,
Ted Rodriguez-Bell
[email protected]<mailto:[email protected]>
Wells Fargo, z/VM and z/Linux
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