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SubjectRe: elevator algorithm bug in ll_rw_blk.c


On Sun, 15 Nov 1998, Tim Smith wrote:

> On Sun, 15 Nov 1998, Vojtech Pavlik wrote:
> > You could apply a two way elevator well if you knew about the physical
> > characteristics of the drive. Unfortunately there is no way to find that out
> > for most modern drives.
>
> Actually, by analyzing timings on carefully selected request sequences, you
> can figure out pretty much all of the physical characteristics of most
> drives. See

In fact, we don't care about the geometry of the drives at all. What we
care about is timings. Would it make sense to have a utility that
"autocalibrates" drive by performing a series of tests and then generating
the best scheduler ? Looks like fun :) We don't even have to calibrate for
writes (at first) , reads take most of time..

Vladimir Dergachev


>
> http://www.ece.cmu.edu/~ganger/papers/
>
> --Tim Smith
>
>
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