Messages in this thread | | | Date | Sun, 15 Nov 1998 23:30:59 -0500 (EST) | From | Vladimir Dergachev <> | Subject | Re: elevator algorithm bug in ll_rw_blk.c |
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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 > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ >
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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