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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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