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    SubjectRe: [RFC] - Some notions that I would like comments on
    Chuck Lever wrote:
    > > > I mean, is "readaround" for block @ 128k-192k triggered by
    > > > reading/paging within block @ 64k-128k, or is it triggered by the first
    > > > read with 128k-192k?
    > >
    > > No, not yet: it's something which we'll probably do eventually.
    > > However, on any vaguely modern hardware, the track buffers on the disk
    > > itself will keep filling once you've submitted one IO. Accessing the
    > > next cluster will take a latency hit on the CPU, but we still get the
    > > full disk bandwidth overall.
    > why trigger a page-in for the next cluster? doubling the cluster size
    > might give the same behavior.

    I don't see how it will. Doubling the cluster size just halves the
    number of times when we get the latency hit of a synchronous read of the
    first page in a cluster.

    -- Jamie

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