Hi,
I've noticed a possible problem with scsi_debug devices where
optimal_io_size < minimum_io_size.
The problem seems reproducable with kernel 4.4.0 and also with
stable version 4.1.15. For stable tree the last known working
version is 4.1.13.
How to reproduce:
uname -mr
modprobe -r scsi_debug
modprobe scsi_debug dev_size_mb=100 sector_size=512
udevadm settle
devname=$(grep --with-filename scsi_debug /sys/block/*/device/model | awk -F '/' '{print $4}')
cat /sys/block/$devname/queue/{minimum_io_size,optimal_io_size}
modprobe -r scsi_debug
## output kernel 4.1.13 (openSUSE Leap):
4.1.13-5-default x86_64
512
32768
## output kernel 4.1.15 (openSUSE Leap):
4.1.15-8-default x86_64
512
64
cu,
Rudi
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