Re: [Xen-devel] netfront/netback multiqueue exhausting grants

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.01.16 at 11:40, <bob.liu@xxxxxxxxxx> wrote:
> On 01/22/2016 03:53 PM, Jan Beulich wrote:
>>>>> On 22.01.16 at 04:36, <bob.liu@xxxxxxxxxx> wrote:
>>> By the way, do you think it's possible to make grant table support bigger 
>>> page e.g 64K?
>>> One grant-ref per 64KB instead of 4KB, this should able to reduce the grant 
>>> entry consumption significantly.
>> 
>> How would that work with an underlying page size of 4k, and pages
>> potentially being non-contiguous in machine address space? Besides
>> that the grant table hypercall interface isn't prepared to support
>> 64k page size, due to its use of uint16_t for the length of copy ops.
> 
> Right, and I mean whether we should consider address all the place as your 
> mentioned.

Just from an abstract perspective: How would you envision to avoid
machine address discontiguity? Or would you want to limit such an
improvement to only HVM/PVH/HVMlite guests?

Jan


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