Getting Threshold traffic reach 40G

[hardwar315]

Hi All,
I've a router juniper MX960 and have traffic is 120Gbps. I am trying to set a 40Gigabits threshold on traffic in and traffic out graphs. I don't understand the threshold current numbers. They are in orders of magnitude higher than the data I am seeing.


I am using 64-bit counters, does this cause a problem? What is the correct math for converting this current value into Gigabits/s?
How do configure CDEF's value to correct traffic when over 40G?

P/S: I've using cacti 1.1.16 and threshold 1.0.3