On Mon, 16 Nov 1998 06:16:00 -0500 (EST), Robert Minichino
<rmini@joni.pasture.net> said:
> The modified elevator algorithm as currently used is more than
> adequate for most workstation and light server use; it's reasonably
> fair, and most workstation disk drives do little to no reordering
> (buffers on typical IDE drives range from 64-512k). However, with an
> intelligent caching disk controller (either on the HBA, or a SCSI-SCSI
> RAID controller), the sorting of disk blocks can actually decrease
> performance.
For such disks, just enable tagged command queueing: we already let the
disks reorder as many commands as we can fit into the tagged command
queue.
--Stephen
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