Re: [Xen-devel] [PATCH 5/5] xen: add new hypercall to get grant table limits

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.08.17 at 17:13, <jgross@xxxxxxxx> wrote:
> On 24/08/17 17:04, Jan Beulich wrote:
>>>>> On 24.08.17 at 16:48, <jgross@xxxxxxxx> wrote:
>>> How would the guest know whether using v2 grants is no disadvantage?
>> 
>> As said - it's always going to be a disadvantage. Even if controlling
>> the number of frames per-domain, that same number of frames
>> will always fit more v1 than v2 entries.
> 
> And my patches break the assumption "same number of frames".
> 
>> I don't think the config
>> setting should directly control the number of active grants.
> 
> Why not? In the end that number is the one the guest is interested in.

And the resource use is what the admin is interested in.

> BTW: the number of needed maptrack frames is depending on the number
> of grants only, not on v1 or v2. And the default for the max. number
> of maptrack frames is much higher than the one of the grant frames
> (1024 vs 32).

Of course.

Jan


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