On 09/02/2012 07:45 PM, Heinz Diehl wrote:
> On 02.09.2012, Milan Broz wrote:
>
> [....]
>
> Thanks a lot, Milan! Now it's all clear to me.
>
> My main intention is to set "noop" as the default elevator, and switch
> to cfq for the harddisk via rc.local when booting (it's a conventional
> rotating drive, no SSD). This has the effect that all USB drives
> plugged in later will get "noop" as their active scheduler, since it's
> the default, while all partitions on the harddisk have "cfq".
>
> This way, I avoid hair-pulling work with udev/systemd to have "noop"
> for all non-rotational drives plugged in :-)
You can also use udev rules to do this
(not tested but something like):
Add /etc/udev/rules.d/20-elevator.rules
# set cfq for all rotational devices
SUBSYSTEM=="block", ACTION=="add", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="cfq"
(or perhaps reverse is better:)
SUBSYSTEM=="block", ACTION=="add", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop"
.. or/and for USB
# set noop for usb disks
SUBSYSTEMS=="usb", ACTION=="add", KERNEL=="sd*[!0-9]|sr*", ATTR{queue/scheduler}="noop"
(Btw I think "deadline" could be better for USB.)
Milan
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