Re: [XenARM] [Android-virt] [ANNOUNCE] Xvisor ARM better than KVM ARM in CPU virtualization

[Peter Maydell <peter.maydell@xxxxxxxxxx>]

2012/5/5 Anup Patel <anup@xxxxxxxxxxxxxx>:
> This announcement is to show an apple to apple performance comparison
> between Xvisor ARM and KVM ARM running on VExpress-A15 Fast Model.

I would strongly caution against trying to do any performance/timing
type tests if you're still running on the ARM Fast Model -- they are
not representative of performance characteristics on hardware
and you really can't draw any conclusions about real world
performance by timing things on a model. It's quite easy to get
into a situation where all you're measuring is "does my code happen
to do a lot of some perfectly reasonable operation which happens
to be hard and slow to implement for the model?".

(Also, KVM for ARM is still under development and we haven't
yet made several of the obvious performance improvements like
in-kernel irqchip and timer support, so it's not really a very
useful thing to compare against yet.)

-- PMM

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