Brian J. Murrell wrote: > 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.
For all practical purposes, it is. You must guarantee each class a non-zero bandwidth but you can make it so low as to be meaningless. -Tom -- Tom Eastep \ When I die, I want to go like my Grandfather who Shoreline, \ died peacefully in his sleep. Not screaming like Washington, USA \ all of the passengers in his car http://shorewall.net \________________________________________________
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