Question on Sigtran parameters for congestion handling
Last updated on JUNE 15, 2016
Applies to:Oracle Communications EAGLE (Software) - Version EAGLE 3x.x and later
Information in this document applies to any platform.
Question 1 : Do you know how to determine the RTT of a association in STP ?
I found in the result of cmd="sctp -a" show: "RTT between RMIN and RMAX inclusive = 22"
Does it mean that the RTT of this association is 22 ms. (i attached the log).
Question 2 : In Sigtran user guide document, it said:
"As a general rule, setting CWMIN to a value equal to half of the traffic rate in an RTT interval should allow adequate retransmit-recovery time while preventing excessive load to the peer.
CWMIN = (Bytes/Sec * RTT) / 2 bytes"
What is the traffic rate ? Does it mean the real traffic rate ?
Question 3 : Sigtran User Guide Page 94 said: Use the Weighted Average RTT for defining RMIN. So should i change RMIN of this assoc from 120 to 34 ?
Question 4 : Sigtran User Guide Page 93 said: RMAX can be set to the worst recorded RTT. So should i change RMAX of this assoc from 800 to 115.
Question 5 : For CWMIN, from the log we have the peak traffic of this association is 699 TPS = 699*150 = 104850 byte/s. (104850 * 0.034)/2 =1782 so we will not change CWMIN (default 3000).
Question 6 : What about bufsize, what is different between CWMIN and Bufsize? What value should I set for Bufsize ?
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