Hi All, 
To specify a path by minimum cost for sending a flow, I want to calculate the 
cost of link in Ryu controller by the following equation:

cost(e)=delay(e) + PL(e) ∀ e ε E

delay(e) is delay of link e. PL(e) is packet loss of link e. How to get delay 
and packet loss of a link in realtime using Ryu and OpenFlow?

Thanks.
 
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