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SubjectRe: elevator algorithm bug in ll_rw_blk.c
On Sun, Nov 15, 1998 at 06:30:25PM +0100, Martin Mares wrote:
> Track-to-track seek speeds are not directional, but inter-sector
> speeds are and since the algorithm has no information on physical
> disk geometry, it cannot distinguish whether two sectors are on
> the same track or not.

well perhaps it should
all this crap to deal with logical block number has lost all the optimization that
is possible by taking into account physical distances on the disk.

i think it was rsx-11 which used to format the disk to take into account
retational delays

of course the other side of the coin is that all this sorting increases the
potential for problems when metadata on the disk becomes inconsistent. i know
disks are pretty reliable these days, but the os has been know to crash now and
then :-)
--
simon

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