On Fri, Jan 13, 2006 at 05:49:14PM -0800, Andrew Morton wrote:
> Mingming Cao <[email protected]> wrote:
> >
> > On 2.6.14, the
> > fall back io scheduler (if the chosen io scheduler is not found) is set
> > to the default io scheduler (anticipatory, in this case), but since
> > 2.6.15-rc1, this semanistic is changed to fall back to noop.
>
> OK. And I assume that AS wasn't compiled, so that's why it fell back?
>
> I actually thought that elevator= got removed, now we have
> /sys/block/sda/queue/scheduler. But I guess that's not very useful with
> CONFIG_SYSFS=n.
It's also a lifesaver if the default scheduler happens to trigger some breakage
preventing boot, and you can tell users to workaround it with a bootparam
until the real problem is fixed (which has bitten us twice now, as Fedora
like several other distros chooses CFQ by default).
Dave
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