I have the following skeleton of classes ("a" is the number of my eth0
device in tcdevices):
a:13, priority:2, guaranteed speed 320kbit to 320kbit - Main class for
outgoing - to my ISP1 - traffic (much lower speeds than the rest of my
nets: 40KB/s out, 1200KB/s in - that is KBytes - as in 1024 bytes, not
kbits)!
a:13:14, priority 2, guaranteed speed 120kbit to full (40KB/s), dmax
50ms, umax 1500b - VOIP traffic routed outside
a:13:15, priority 3, guaranteed speed 80kbit to full, dmax ??, umax
1500b - VPN 1 traffic going out
a:13:16, priority 4, guaranteed speed 80kbit to full, dmax ??, umax
1500b - VPN 2 traffic going out
a:13:17, priority 5, guaranteed speed 40kbit to full, dmax ??, umax
1500b - other unclassified traffic going out
a:18 ... (other internal GBit traffic)
My question is - I have read the superbly put section on HFSC in the
complex traffic shaping article
(http://shorewall.net/traffic_shaping.htm), which deciphers the "HFSC
Scheduling with Linux" article //pretty well (thanks Tom!), and spend an
hour calculating the subclasses' dmax times (yes, I managed to do it at
the end, I think) following the example in that article.
What I am not entirely certain is this - can I use more than one class
on which to "boost" the dmax values as I did with the VOIP class (13:14)
above - on class 13:15 for example - and dump all the excesses from both
classes on the remaining "leaves" - classes 16 and 17? I know their dmax
values could be in their hundreds of milliseconds, but I am prepared to
take that hit.
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