lkml.org 
[lkml]   [1998]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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
>
>
> -
> 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/

\
 
 \ /
  Last update: 2005-03-22 13:45    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site