hi,

afaik, there's no existing ryu apps which do that.

just an idea:

a. controller-switch latency can be measured using echo requests.
b. controller-switch-switch-controller latency can be measured using
   packet-out/in.

(b - 2 * a) might be what you want.

YAMAMOTO Takashi

> Hi,
> 
> 
> I attempt to work at QoS experiment and Monitor the network resource in RYU 
> controller. However,I don't know how to measure the link delay in RYU. Does 
> RYU support to measure the delay for every link ? How should I do ?
> 
> 
> thanks

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