Re: [Xen-devel] Discussion about virtual iommu support for Xen guest

["Lan, Tianyu" <tianyu.lan@xxxxxxxxx>]

On 5/27/2016 4:19 PM, Lan Tianyu wrote:
> > > As for the individual issue of 288vcpu support, there are already issues
> > > with 64vcpu guests at the moment. While it is certainly fine to remove
> > > the hard limit at 255 vcpus, there is a lot of other work required to
> > > even get 128vcpu guests stable.
> Could you give some points to these issues? We are enabling more vcpus
> support and it can boot up 255 vcpus without IR support basically. It's
> very helpful to learn about known issues.
Hi Andrew:
We are designing vIOMMU support for Xen. Increasing vcpu
from 128 to 255 also can be implemented parallelly since it doesn't
need vIOMMU support. From your previous comment "there is a lot of other
work required to even get 128vcpu guests stable", you have some concerns 
about stability of 128vcpus. I wonder what we need to do before
starting work of increasing vcpu number from 128 to 255?

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