Re: [Xen-devel] [PATCH] xen/domctl: lower loglevel of XEN_DOMCTL_memory_mapping

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

> > Right, that's one of the things that would need taking care of.
> > (Whether enforcing an upper limit is actually needed I'm not
> > sure - we generally allow the admin to shoot himself in the foot
> > if he wants to. And whether the lower limit should be 64 instead
> > of just ensuring the limit is not zero is another question.)
> 64 was semi-arbitrary  - it ended up giving good latency on
> highly scalar machines (8 socket). Higher numbers ended up
> affecting the latency.
>
> But higher numbers on small socket machines were OK.
> (As they do not have 8 IOMMU VT-d chipsets all potentially
> flodding the QPI with serialized cache flushes).
> >
So we should make this range [8, <Its up to the user>] here, but 64 by 
default. Right?
Thanks
Tiejun


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