Re: Fall back io scheduler for 2.6.15?

[Dave Jones]

On Fri, Jan 13, 2006 at 05:49:14PM -0800, Andrew Morton wrote:
 > Mingming Cao <cmm@xxxxxxxxxx> 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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