[lkml]   [2007]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

    * Avi Kivity <> 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

    > 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 :)

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-02-27 17:25    [W:0.031 / U:1.856 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site