[dpdk-dev] [RFC 0/7] PMD driver for AF_XDP

[Jason Wang]

On 2018年03月01日 20:56, Zhang, Qi Z wrote:
>>>>>> BTW, performance test shows our PMD can reach 94%~98% of the
>>>>>> orignal benchmark when share memory is enabled.
>>>>> Hi:
>>>>>
>>>>> Looks like zero copy is not used in this series. Any plan to support that?
>>>> Zero copy is enabled in patch 5, if a mempool passed check_mempool,
>>>> it will be registered to af_xdp socket.
>>>> so there will be no memcpy between mbuf and af_xdp.
>> Aha, I see. So the zerocopy was limited to some specific use case. And if I
>> understand it correctly, zc mode could not be used for VM.
> I think except the limitation for mempool layout, zerocopy is transparent to DPDK application, only difference is performance.
> Sorry, I may not get your point, if you could explain more about the VM usage.
>
> Regards
> Qi

No problem, so the question is:

Can zerocopy be used when using testpmd to foward packets between 
vhost-user and AF_XDP socket?

Thanks