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SubjectRe: elevator algorithm bug in ll_rw_blk.c
According to Stephen C. Tweedie:
> The queue is always kept sorted, yes, but as soon as an IO starts,
> the current request is not removed from the queue until IO is
> complete (except for SCSI, which does its own queue ordering). Once
> that single IO request is complete, the driver then moves on to the
> *next* request in the queue. It doesn't start again at the
> beginning. So, we do correctly service the higher numbered requests
> before going back to the low ones.

But that's a *one-way* elevator. Ideal elevators are two-way, aren't they?
--
Chip Salzenberg - a.k.a. - <chip@perlsupport.com>
"There -- we made them swerve slightly!" //MST3K

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