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SubjectRe: elevator code

Martin,

I'm glad you are not still mad at me. :-) I hope this info was
helpful.

:-)

Jeff

Martin Dalecki wrote:
>
> "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
> *very*
> 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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