Il giorno 13 lug 2017, alle ore 16:02, Jens Axboe [off-list ref] ha =

scritto:

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On 07/13/2017 04:11 AM, Johannes Thumshirn wrote:

quoted

On Wed, Jul 12, 2017 at 04:51:33PM -0600, Jens Axboe wrote:

quoted

No, that boot option was a mistake, let's not propagate that to mq
scheduling as well.

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Can you please explain why? I as well have requests from our users to
select the mq schedulers on the command line.

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Because it sucks as an interface - there's no way to apply different
settings to different devices, and using the kernel command line to
control something like this is ugly. It never should have been done.
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The sysfs interface, either manually, scripted, or through udev,
makes a lot more sense.
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One doubt: with the new interface, and using, I guess, udev, is it
still possible to control which I/O scheduler is actually used during
all the boot process, or at least almost all of it?

Thanks,
Paolo

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Jens Axboe
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