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    SubjectRe: Bio pool & scsi scatter gather pool usage
    Alan Cox wrote:
    >
    > > Perhaps, but calls are expensive. Repeated calls down stacked block
    > > devices will add up. In only the most unusually cases will there
    >
    > You don't need to repeatedly query. At bind time you can compute the
    > limit for any device heirarchy and be done with it.
    >

    S'pose so. The ideal request size is variable, based
    on the alignment. So for exampe if the start block is
    halfway into a stripe, the ideal BIO size is half a stripe.

    But that's a pretty simple table to generate once-off,
    as you say.

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