Mailinglist Archive: opensuse (1047 mails)

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Re: [opensuse] need debugging help (openSUSE LEAP)
On Friday 29 January 2016, Carlos E. R. wrote:
On 2016-01-29 15:12, Ruediger Meier wrote:
Hi LEAP users,

please could someone run these commands for me and send
me the output?

Eleanor-421:~ # uname -mr
4.1.12-1-default x86_64
Eleanor-421:~ # modprobe -r scsi_debug
Eleanor-421:~ # modprobe scsi_debug dev_size_mb=100 sector_size=512
Eleanor-421:~ # udevadm settle
Eleanor-421:~ # devname=$(grep --with-filename scsi_debug
/sys/block/*/device/model | awk -F '/' '{print $4}')
Eleanor-421:~ # cat
/sys/block/$devname/queue/{minimum_io_size,optimal_io_size}
512
32768
Eleanor-421:~ # modprobe -r scsi_debug
Eleanor-421:~ #

I want to compare the output of different kernel version 4.1.12,
4.1.13 and 4.1.15. Maybe there is a bug. So I'm specially
interested in up-to-date and not-fully-updated Leap installations.

Uh, oh... I'm running a YOU while I typed the above, so I'm
uncertain. The update is huge, by the way, I'm quite surprised.
Biggest I have seen on a machine updated the previous week.

I'll wait till I reboot the machine (it is a virtual one, vmplayer).
Ok, rebooted, try again.

Eleanor-421:~ # uname -mr
4.1.15-8-default x86_64
Eleanor-421:~ # modprobe -r scsi_debug
Eleanor-421:~ # modprobe -r scsi_debug^C
Eleanor-421:~ # modprobe scsi_debug dev_size_mb=100 sector_size=512
Eleanor-421:~ # udevadm settle
Eleanor-421:~ # devname=$(grep --with-filename scsi_debug
/sys/block/*/device/model | awk -F '/' '{print $4}')
Eleanor-421:~ # cat
/sys/block/$devname/queue/{minimum_io_size,optimal_io_size}
512
64
Eleanor-421:~ # modprobe -r scsi_debug
Eleanor-421:~ #


Quite different.

Thanks a lot Carlos and Malcolm!

Seems that there is an issue from kernel 4.1.13 to 4.1.5.
Looks strange that "optimum" is smaller than "minimum".

If you wish, I can try later on my laptop, before and after the
update.

Maybe you can just reboot once again with old kernel to be 100% sure
that it was the kernel update and not some of the other updates.

FYI the original problem come from util-linux mailing list
http://thread.gmane.org/gmane.linux.utilities.util-linux-ng/11966

cu,
Rudi
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