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

[Bob Liu <bob.liu@xxxxxxxxxx>]

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.
With multi-queue xen-block and xen-network, we got more reports that the grants 
were exhausted.

-- 
Regards,
-Bob

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