Thank you for the update. I am then not sure why it is also "wrong" in
CentOS 7 guest. The inconsistency with other Linux distributions is what
I am concerned about...
# uname -a
Linux centos7-vm2 3.10.0-123.4.2.el7.x86_64 #1 SMP
Mon Jun 30 16:09:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
# cat /sys/block/vda/queue/scheduler
noop [deadline] cfq
# ./Linux-check-IO-scheduler-and-discard-support.pl
INFO: File systems and raids
NAME FSTYPE LABEL UUID
MOUNTPOINT
sr0
vda
├─vda1 xfs
a1652174-58b6-4e97-a3ca-4a2160a31100 /boot
└─vda2 LVM2_member
fVCpR3-mtm0-J1KU-XG56-IvOx-9Use-tqS0o2
├─centos_centos7--vm2-swap swap
ad6f9fd9-59a5-49b2-afe9-531a8b74a446 [SWAP]
└─centos_centos7--vm2-root xfs
63a2a109-cb5a-4b75-ac63-b903d81df633 /
INFO: Block devices
NAME ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED
RQ-SIZE RA WSAME
sr0 0 512 0 512 512 1 cfq
128 128 0B
vda 0 512 0 512 512 1
deadline 128 4096 0B
├─vda1 0 512 0 512 512 1
deadline 128 4096 0B
└─vda2 0 512 0 512 512 1
deadline 128 4096 0B
├─centos_centos7--vm2-swap 0 512 0 512 512 1
128 4096 0B
└─centos_centos7--vm2-root 0 512 0 512 512 1
128 4096 0B
INFO: I/O elevator (scheduler) and discard support summary
INFO: Hard Disk vda configured with I/O scheduler "deadline"
All other KVM guests that I run exhibit different reports from Ubuntu
14.01:
OpenSUSE Linux 13.1 (3.11.10-17.x86_64 #1 SMP PREEMPT)
Oracle Linux 6.5 (3.8.13-35.1.2.el6uek.x86_64 #2 SMP)
CentOS Linux 7.0.1406 (3.10.0-123.4.2.el7.x86_64 #1 SMP)
Regards,
Dusan
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https://bugs.launchpad.net/bugs/1346687
Title:
Ubuntu 14 KVM Guest I/O Elevator Non-configurable
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