Re: scheduler question 2.6.16.x

[Andre Tomt]

Nick Warne wrote:
> On Tuesday 25 April 2006 19:15, Jens Axboe wrote:
>
> > > But I can build both in... so I guess then the kernel decides what is
> > > the best to use?  Or should it be so I am only allowed to select one
> > > or the other and allowing both is an oversight?
> > See the option no more than two lines down from that, default io
> > scheduler. Also see Documentation/block/switching-sched.txt and/or
> > Documentation/kernel-parameters.txt (elevator=) section.
>
> Hi Jens,
>
> I haven't got the switching-sched.txt, although I found a sched-design.txt... 
> but what I meant was if I select whatever default, do/can I still need to 
> select either/or scheduler?
>
> i.e. why doesn't 'default selection option' only allow that scheduler to be 
> selected?

That would be a artificial (and silly!) limit - the io-scheduler is 
pluggable and selectable at boot, you can even change it at run time at 
a per block device level.

See the elevator= boot option and /sys/block/<device>/queue/scheduler
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