On Sun, 2009-05-24 at 14:51 -0700, Tom Eastep wrote: > > For those of you who might still be interested in this issue, Shorewall > 4.3.12 will include support for HFSC (Hierarchical Fair Service Curve).
Hrm. Another huh? > HFSC is superior to HTB when realtime traffic such as VOIP is involved. > Beware, though, that HFSC is even harder to configure than HTB. I guess the problem I always had with HTB and maybe it was just the various explanations and examples I saw, but it was that a high priority class (i.e. voip) was not actually able to use all of the bandwidth if it needed it. I used to do TC without any fancy classifiers and just used queues to put traffic into "priority bands" where the highest priority traffic always got all of the bandwidth it needed, and only if there was bandwidth left after a given priority band took it's need, would a lower band get any. So yes, it was entirely possible for the lowest band(s) to get starved, but that was the nature of the priorities. Maybe HTB is capable of that. I just never saw it. If it isn't, is HFSC any better in this regard? b.
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