Re: Utility of PV on non-obsolete hardware

[Greg Troxel <gdt%lexort.com@localhost>]

"Mathew, Cherry G." <cherry%zyx.in@localhost> writes:

> On 4 April 2019 3:06:18 PM GMT+05:30, tg%gmplib.org@localhost wrote:

>>Seriously, plain PV is perhaps only useful on machines without EPT/NPT.
>>Our test systems with Intel Conroe (2006), Intel Penryn (2007), and AND
>>K8 (2003) are the only ones which benefit from PV.
>
> That's a good point - I'm surprised about the I/o performance though - were you using virtio ?
>
>  I'm about 70% of the way enabling PVHVM for domU - we have PoC but needs a bit more debugging etc. Also looking at non PV Dom0 solutions.

Is this slowness of PV expected and understood?  Is it about the cost of page
table update hypercalls?  Could it be a difference in using multiple
cores vs not?