Re: [Xen-devel] [PATCH 4/5] xen: support different gnttab_max_frames for grant v1 and v2

2017-08-24 Thread Juergen Gross
On 24/08/17 17:01, Jan Beulich wrote: On 24.08.17 at 16:54, wrote: >> OTOH I think there should be a default especially on huge hosts >> allowing to use v2 grants without reducing the number of allowed >> grants, which doesn't need adding another parameter to the domain >>

Re: [Xen-devel] [PATCH 4/5] xen: support different gnttab_max_frames for grant v1 and v2

2017-08-24 Thread Jan Beulich
>>> On 24.08.17 at 16:54, wrote: > OTOH I think there should be a default especially on huge hosts > allowing to use v2 grants without reducing the number of allowed > grants, which doesn't need adding another parameter to the domain > config. Or do you want the tools to always

Re: [Xen-devel] [PATCH 4/5] xen: support different gnttab_max_frames for grant v1 and v2

2017-08-24 Thread Juergen Gross
On 24/08/17 16:21, Jan Beulich wrote: On 21.08.17 at 20:05, wrote: >> The number of grants a domain can setup is limited by the maximum >> number of grant frames it is allowed to use. Today the limit is the >> same regardless whether the domain uses grant v1 or v2. Using v2

Re: [Xen-devel] [PATCH 4/5] xen: support different gnttab_max_frames for grant v1 and v2

2017-08-24 Thread Jan Beulich
>>> On 21.08.17 at 20:05, wrote: > The number of grants a domain can setup is limited by the maximum > number of grant frames it is allowed to use. Today the limit is the > same regardless whether the domain uses grant v1 or v2. Using v2 > will therefor be a disadvantage for the

[Xen-devel] [PATCH 4/5] xen: support different gnttab_max_frames for grant v1 and v2

2017-08-21 Thread Juergen Gross
The number of grants a domain can setup is limited by the maximum number of grant frames it is allowed to use. Today the limit is the same regardless whether the domain uses grant v1 or v2. Using v2 will therefor be a disadvantage for the domain as only half the number of grants compared to v1 can