From: Jonas.Dormagen@xxxxxxxx
Date: Tue Jun 06 2000 - 05:48:47 GMT-3
Hi Earl,
I have some experiences with the "nightmare" of COQ. The key issue is the AIR
of the uses link.
I am using the following configuration in a very large VPN.
It is :q1=70%, q2=20% , q3=10 % of the linkspeed.
If the link has e.g. CIR=32kbps EIR=16kbps so AIR=48000
So for each cycle we have to send :
q1 : 48000 * 70% = 33600
q2 : 48000* 20% = 9600
q3 : 48000*10% = 4800 (this represent 4 packets of 1500 bytes)
to fill the AIR in 1s.
We can decide to use these values as byte count for each queue.
Or to be smooth we can decide to complete a cycle in less than 1s.
So for example to send 2 packets in q3 instead of 4 .
To be sure not to send more than 2 packets (2*1500=3000) let use q3 byte-count
=
2990
So q2 byte-count should be the double of q3 byte count => 6000
and q1 byte-count should be q3 byte-count * 7 > 21000.
The idea is to be smooth to avoid traffic to be bursted / to wait on each queue
even on small links.
Is you are smooth on small link, then you will be smooth on big link, so there
is no need the change
the values with bigger AIR.
I hope this help.
best regards
Jonas
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