Re: Which I/O scheduler is Fedora switching to in 4.21? mq-deadline or BFQ?

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On Wed, Dec 12, 2018 at 2:07 PM Jeff Moyer <jmoyer@xxxxxxxxxx> wrote:
>
> Hi,
>
> Chris Murphy <lists@xxxxxxxxxxxxxxxxx> writes:
>
> > I used two boot params: scsi_mod.use_blk_mq=1 elevator=bfq. I don't
> > think that's a good way for a distribution to set the default though.
>
> You shouldn't need the "scsi_mod.use_blk_mq=1" option.  As of 4.19,
> scsi_mq is the default, and by 4.21 the legacy path will be gone.  The
> right way for the distro to set the default I/O scheduler is to use udev
> rules.

Like I mentioned earlier in the thread, Fedora kernels does not set
scsi_mq as the default. I don't know why.

# CONFIG_SCSI_MQ_DEFAULT is not set

-- 
Chris Murphy
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