> On 20 Feb 2019, at 09:49, Zhiyong Yang <zhiyong.y...@intel.com> wrote:
> 
> Hi VPP guys,
>                 There exists a “handoff” graph node  in VPP that is named 
> “worker-handoff”. From my understanding, it looks to be  acting as a 
> distributing packets received role in the multi thread working environment , 
> and distribute pkts by hash algo to 1 or more worker threads.  Right?

y, it is basically software RSS....

> One question is that which use cases can demostrate how  the graph node is 
> applied in VPP.  If have any, please show me.

see "set interface handoff" cli...

> I know that nat also use similar handoff  cases. And if NAT is using this 
> “worker-handoff” graph node or not. If not, what’s difference between these 
> handoff graph nodes?

worker-handoff node does handoff decision based on basic l2-l3-l4 hash, nat 
handoff node does handoff decision based on NAT session locality.


>                 BTW, I mainly intend to study core to core applications by 
> this for multiple-thread working model in VPP. Appreciate your input in 
> advance.

-- 
Damjan

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