Need explanation about calls per second (CPS) value in log.sipd

Acme Packet 6350 - SCZ8.4.0

Hello the community,

I'd like to have some information about this line below (log.sipd):

Jun 21 15:06:56.464 [SIP] (0)  cur=10.3 lo=2.7 hi=11.0 avg=2.7 (90%=2232.0)

From my understanding :

• cur=10.3 : is the current value of CPS . This value is calculated based on a sliding window of 100 seconds. 
• (90%=2232.0) : This value is an extrapolation of how many CPS the system should be expected to perform if the CPU were at 90% utilization (estimate only).

But what about :

• lo=2.7 --> ?
• hi=11.0 --> ?
• avg=2.7 --> ?

Do you know how are they calculated? over which size of windows?

Thanks a lot,

Regards,

Olivier