Messages in this thread |  | | | Date | Sun, 15 Nov 1998 16:18:31 -0800 (PST) | | From | Tim Smith <> | | Subject | Re: elevator algorithm bug in ll_rw_blk.c |
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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
http://www.ece.cmu.edu/~ganger/papers/
--Tim Smith
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