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On Fri, Aug 05, 2016 at 12:09:50PM +0000, Kostiantyn.Volenbovskyi at swisscom.com wrote:
 
> 3)     The question of cfq vs. deadline vs. noop scheduler (apparently both in guest and host) where decision should be based on workloads/recommendations of OS vendor (/which again might be release-dependent).

on the vm the scheduler should be noop, so the vm does not do any kind
of ordering and passes that work to the hypervisor (which knows better)

on the hypervisor scheduler should be deadline, which is the
recommended scheduler for SSDs

there are rh articles on the net, also I think tuned does that by
default. I set that by hand on my debian images as debian default is CFQ



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