Re: all three IO Schedulers turned on in 2.6.10-rc3-mm1 ???

From: Jens Axboe
Date: Fri Dec 17 2004 - 02:58:42 EST

On Thu, Dec 16 2004, Steven A. DuChene wrote:
> I downloaded and built the 2.6.10-rc3-mm1 kernel and I noticed while
> configuring it that in the Device Drivers > Block devices > IO Schedulers
> area that by default all three IO Schedulers are turned on. Is this a
> normal condition or is there only supposed to be one of these turned on?

They all default to on. There's actually a fourth that is also on, but
you cannot turn that off (noop). It's there if you disable the other
three, in lack of a better way to express that in Kconfig.

> The reason I am concerned about this is that ever since I have booted
> into this kernel I have a lot of things failing and when they fail
> they return a message like "Inappropriate ioctl for device"

The io schedulers don't provide any ioctls, must be something else. I
suggest you strace whatever program is throwing these errors and find
out what is going wrong.

Jens Axboe

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