Re: Fall back io scheduler for 2.6.15?

[Andrew Morton]

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.

> Is there any reason to fall back to noop instead of as?  It seems
> anticipatory is much better than noop for ext3 with large sequential
> write tests (i.e, 1G dd test) ...

I suspect that was an accident.  Jens?
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/