Re: HFSC and prioritization

Linux Advanced Routing and Traffic Control

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Alexandru Dragoi wrote:

> I think i'd like more docs in english about hfsc.

Me too. I don't have time to write one myself (and I'm not good at
this), but I can assist if anyone wants to do it.


> I would like to know
> also some tips about scalability at large amount of traffic, like more
> than 100mbit and more than 20kpps. I had a setup one that share 200mbit
> on 2 imq devices(both with a parent class of 200mbit), each with about
> 1000 hfsc classes. About 2 classes with only rt courves, another 2 with
> rt and ls and ul courves, and the rest (end users) with ls and ul
> courves. All only with m2 parametter. And at high traffic packet loss
> appeared. After switching to htb, no more packet loss.
> 
> Thanks in advance.


Mhh .. I know of setups where HFSC is running with 10k classes and high
bandwidth (>= 100mbit, don't know the exact amount). When switchting to
rbtrees I made some benchmarks and it performed almost identical to HTB,
so my guess is that its related to IMQ, which still seems to be pretty
broken. It could of course also be a different configuration mistake,
hard to tell without seeing the actual configuration.
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