HI All,
I know this isn't Shorewall specific, but I've found the best information
on the math behind the HFSC calculations in the shorewall
documentation<http://www.shorewall.net/traffic_shaping.htm>.
Please feel free to point me somewhere else.
Regarding this paragraph:
Assume that both class 1:11 and 1:12 transmit for 30 ms at 400kbits/second.
That is a total of 800kbits/second for 30ms. So Class 1:11 is punished for
the excess. How long is the punishment? The two classes sent 24,000 bits in
30ms; they are only allowed 0.030 * 500,000 = 15,000. So they are 9,000
bits over their quota. The amount of time required to transmit 9,000 bits
at 400,000 bits/second is 22.5ms!.
1. The first 30ms indicated. This refers to the Service Curve's (SC)
delay, not the other classes delay (User A Data)?
2. The 22.5ms is based on 9000 overage and the class data rate (User A
Data), not the service curve's rate.
3. Were there 3 leaf classes instead of the 2 given, the 22.5ms calculation
is made on each leaf class:
#INTERFACE:CLASS MARK RATE: CEIL PRIORITY OPTIONS
# DMAX:UMAX
1:10 1 500kbit full 1
1:20 2 500kbit full 1
1:10:11 3 300kbit:70ms:1500b full 2
1:10:12 4 100kbit:30ms:1500b full 2
1:10:13 4 100kbit:210ms:1500b full 2
Q delay would naturally be 40,120,120 (max 52,132,132)
With the same example, SC@400kb/s on :12, we are still 9000 bits over in
30ms.
9000 bits@300kb/s=30ms
9000 bits@100kb/s=90ms
Therefore UserAData requires additional 30ms=70, UserAOther requires
additional 90ms=210
Thanks for any help -- lee
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