Hi,

in your case most of NAT translations are done in one core. With 4 cores you 
are lucky and flows arrive at same core where translations are processing (no 
worker handoff) and with 10 cores there is worker handoff between two workers 
and it is reason of performance drop. Basically your flows are not 
symmetrically distributed between cores.

Matus


From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of JB
Sent: Friday, December 21, 2018 4:25 AM
To: vpp-dev@lists.fd.io
Subject: Re: [vpp-dev] NAT workers above 4 completely tanks performance

Hi Damjan,

Absolutely.

I raw one case with the default number of NAT workers (10) which has poor 
performance, and another case with a fewer number of NAT workers (4) showing 
great performance. They're separated by two different files, both are attached.

John
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