Re: [LARTC] Fair bandwidth oversubscribing ? How with HTB ?

["Santiago J. Ruano Rincón" <santiago@avatar.com.co>]

try HFSC, Hierarchical Fair Service Curve:

http://trash.net/~kaber/hfsc
http://www-2.cs.cmu.edu/~hzhang/HFSC/

i'm going to test it in this week.

Quoting Simon Byrnand <simon@igrin.co.nz>:

> Hopefully someone has a suggestion on how I might do this...as I can't
> figure it out :(
> 
> I need to be able to set up a group of seperate users who have a
> "bandwidth pool" they share, but also be able to limit their individual
> bandwidth as well.
> 
> Example:
> 
> I have 5 customers and would like to be able to provide them with a
> maximum of 256Kbit each, with a CIR of 33%.
> 
> To do this, I'd like the 5 customers to share a parent group which is
> therefore limited to 426Kbit, Which is 5*256Kbit/3.
> 
> The idea being that individual customers can achieve up to a maximum of
> 256Kbit provided that the total group pool doesn't exceed 426Kbit, and if
> the total group pool maxes out, then each customer should get reduced
> bandwidth in fair ratios based on their individual maximum setting.
> (Currently 256Kbit for all of them, but I'd like to be able to
> differentiate them later)
> 
> If all 5 were trying to fully utilize their bandwidth at the same time,
> they should get a fairly distributed 33% of their maximum - eg about
> 85Kbit.
> 
> The problem I can see is that both CBQ and HTB don't seem to honour
> situations where the sum of all the child rates exceeds the parent rate -
> the parent rate is ignored so the 426Kbit cap is exceeded. The HTB docs
> even explicitely say this won't work.
> 
> So is there any tricky way to do this with slightly different semantics ?
> Surely there must be some way :-) I've spent many long hours studying CBQ
> and trying things out and finally came to the conclusion that CBQ alone
> just can't do it, but I was hoping HTB could, but thus far I've been
> unsuccessful here too..
> 
> Currently I'm using CBQ but I'm limited in that the individual maximum
> speeds can only equal the parent group maximum bandwidth which is workable
> for a few customers, but not very satisfactory and not flexible enough as
> I add more customers.
> 
> If someone could point me in the right direction or just give me a firm
> "nope, can't be done" that would be great....
> 
> I'd also like to enable short term bursting over and above this as well,
> to improve responsiveness during downloading, say, 33% overbandwidth for 5
> seconds, that sort of thing, but I'll cross that bridge when (if) I get to
> it...(any comments here on how effective enabling bursting is for reducing
> the dreaded unresponsiveness-during-downloads problem would be welcome
> too)
> 
> Regards,
> Simon
> 
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Santiago J. Ruano Rincón

Avatar Ltda.
ParqueSoft Popayán
+57-2 8221214

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