question on data center benchmarking draft

Hi Lucien,



When reading your draft about the methodology of the data center benchmarking（ draft-bmwg-dcbench-methodology-02）, we found it an very interesting and useful document, and we are trying to apply it into our experiments with DC switches.

However, there are some questions:

(1) what does PORT CAPACITY mean in section 2.2 ? 

(2) why latency and jitter are not considered if the traffic generator can not be connected to all ports on the DUT in section 2.2? 

     In our case, we'd like to test the relationship between the frame latency and the switch while we only have a generator with not so many ports.

(3) In Section 3.2, Measure maximum DUT buffer size with many to one ports, what does the equation ((N-1)/port capacity * 99.98)% in the iteration mean? What do you expect from the setting?

(4) In section 6, what is the definition of stateful and stateless flow from the generator side of view? There are only unofficial descriptions like “large and small flows” in the text, but in practice, like how can we use in testing setup to produce  the large and small flow?

(5) There is no clear definition for “flow latency”. Is it the same as the frame latency definition defined in the metric draft (draft-dcbench-def-01)?




Thank you very much!

Best,

Yang Shi

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