Are all block devices fundamentally elevators or fifos or what?
To be blunt, if a bunch of concurrent processes dump requests on a
noop queue, are they serviced fifo or in elevator order or what?
My goal is to get a dumb elevator that does nothing but sweep up and
down the disk mopping up outstanding requests as the disk heads ooze
across the sectors.
On Sat 16-03-13 02:06:00, Raymond Jennings wrote:
> Are all block devices fundamentally elevators or fifos or what?
>
> To be blunt, if a bunch of concurrent processes dump requests on a
> noop queue, are they serviced fifo or in elevator order or what?
>
> My goal is to get a dumb elevator that does nothing but sweep up and
> down the disk mopping up outstanding requests as the disk heads ooze
> across the sectors.
With noop io scheduler you get the FIFO ordering of requests.
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR