Xen performance on FreeBSD vs Linux

[Roger Pau Monné]

On Sun, Jan 12, 2020 at 09:07:32PM +0200, Stefan Parvu wrote:
> > 
> > Also a FreeBSD dom0 can only work in PVH mode, which is faster for
> > certain operations like page table modifications, but it's slower for
> > others, like issuing hypercalls, when compared to a PV dom0.
> > 
> > I don't have figures at hand now, but guest creation is likely slower
> > on a FreeBSD PVH dom0 than on a Linux PV dom0, and that's because
> > hypercalls are more expensive on PVH than on PV (has nothing to do
> > whether Linux or FreeBSD is used).
> 
> right. thanks a lot for pointers. A bit confusing is that I see mentioned 
> around that Xen of FreeBSD is experimental. Is this true ? 

PVH dom0 support in Xen is experimental, the FreeBSD PVH bits are
mostly stable and I wouldn't expect many changes there except from
bug fixes. The PVH guest ABI is also stable since quite some time
ago.

Thanks, Roger.