Messages in this thread | | | Date | Tue, 27 Feb 2007 17:16:17 +0100 | From | Ingo Molnar <> | Subject | Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3) |
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* 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 :)
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