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    SubjectRe: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

    * Avi Kivity <avi@argo.co.il> wrote:

    > > yeah - that's what testing on ramdisk (Jens') or on a loopback block
    > > device (mine) approximates to a certain degree.
    >
    > Ramdisks or fully cached loopback return immediately, so cache
    > thrashing effects don't show up.

    even fully cached loopback schedules the loopback kernel thread - but i
    agree that it's inaccurate: hence the 'approximates to a certain
    degree'.

    > Maybe a device mapper delay target or nbd + O_DIRECT can insert delays
    > to make the workload more disk-like.

    yeah. I'll hack a small timeout into loopback requests i think. But then
    real disk-platter effects are left out ... so it all comes down to
    eventually having to try it on real disks too :)

    Ingo
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