Use 'none' as default io scheduler for virtio-blk devices. Performance
improvements for multi-queue setups and to reduce CPU consumption.
Signed-off-by: Peter Jin <pjin@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Performance measurements turned out that in certain situations the
paging/swap logic turns on the rotational feature for block devices. In the
past, this feature has been disabled for DASD devices. FCP and NVMe devices
are considered non-rotational by default (or exposed by the storage server).
Because those are the backing devices on Linux on Z/LinuxONE instances,
ensure that virtio-blk devices are always non-rotational.
Signed-off-by: Peter Jin <pjin@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Peter Jin