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SubjectRe: disk head scheduling


On Sat, 20 Mar 1999, Gerard Roudier wrote:
>
> The current request queue in Linux is probably a excellent helper for IDE
> disks and SCSI disks when using a small number of tagged commands and a
> small number of disks at the same time, but for high-end SCSI we want to
> use numerous disks at the same time and to queue them a large number of
> tagged commands.

This is mainly a problem with the SCSI subsystem, rather than anything
else. The SCSI subsystem is not very good at feeding the requests to
different disks, much less different controllers.

The basic IO-request queue is fairly simple, and it's certainly not
perfect, but most of the problems are actually at a different layer. One
obvious one is the SCSI subsystem that forces everything to be on one
queue.

Linus


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