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SubjectRe: elevator code
"Jeff V. Merkey" wrote:

> lessons learned in live customer accounts. In NetWare, requests are
> merged at A) the boundry between the File Cache and the I/O subsystem,
> and B) in the drivers themselves and NOT THE ELEVATOR.

Yes that's the proper place to do this. The generic elevator on a
*single* queue
makes not much sense. Once ago I have just disabled it entierly and on a
system with swap on a separate disk and controller this was a
performance *win*.

Some of the FS code in esp. the ISO9660 does even under linux something
much like this. Many of the prop. cd-rom device drivers are basically
emulating 512k block devices by reading ahead and throwing away data.
There is really plenty of room for improvement here.
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