[LARTC] multiple wrr as child of htb

[LARTC] multiple wrr as child of htb

[at.matei]

Hi all,
Here's the situation.
I have 80 users sharing a internet link of 5Mb link.
The users are grouped in /29 ip addr classes so I have 10 classes of users
I want to create a root htb, then 10 htb childs each with 0.5Mb 
bandwidth. The traffic will be directed to each class using tc filters.
Now, I want that each of  8 users from each class  to share equally the 
class bandwidth. Can I use wrr with 8 classes each as leaf for each htb 
child?
Or, simply said: will each wrr classifier work on all seen ip addresses 
or just the addresses from its htb parent.

Thnaks for any comments,

Alex
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Re: [LARTC] multiple wrr as child of htb

[Gabriel]

On Fri, 20 Jan 2006 12:13:06 +0200, at.matei wrote:

> Hi all,
> Here's the situation.
> I have 80 users sharing a internet link of 5Mb link.
> The users are grouped in /29 ip addr classes so I have 10
classes of users

Maybe I'm getting this wrong, but how can you have 8
users/class in a /29 subnet? Isn't 6 (2^3-1) the max?

> Thnaks for any comments,
>
> Alex

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Re: [LARTC] multiple wrr as child of htb

[Peter Surda]

at.matei schrieb:

> Hi all, 

hi

> Can I use wrr with 8 classes each as leaf for each htb child?

Yes, but ESFQ may be better. I had stability problems when using more 
than 1 WRR per interface, but it is possible that it's fixed now. 
Furthermore, WRR is designed for large numbers so it is an overkill in 
your situation.

> Or, simply said: will each wrr classifier work on all seen ip 
> addresses or just the addresses from its htb parent.

Any seen IP, they are assigned dynamically. If there are too many, the 
classes are "recycled" in a LIFO.

> Thnaks for any comments,

NP.

> Alex

Yours sincerely,
Peter

-- 
http://www.shurdix.org - Linux distribution for routers and firewalls

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Re: [LARTC] multiple wrr as child of htb

[at.matei]

Gabriel wrote:

>On Fri, 20 Jan 2006 12:13:06 +0200, at.matei wrote:
>
>  
>
>>Hi all,
>>Here's the situation.
>>I have 80 users sharing a internet link of 5Mb link.
>>The users are grouped in /29 ip addr classes so I have 10
>>    
>>
>classes of users
>
>Maybe I'm getting this wrong, but how can you have 8
>users/class in a /29 subnet? Isn't 6 (2^3-1) the max?
>  
>
>
Well, think not of ip separate classes but only grouping. From  255 
addresses I can group 8 users by means of tc filter with x.x.x.x/29. 
There are not ip classes but qdisc classes.
You're right about classical subnetting.

Alex
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Re: [LARTC] multiple wrr as child of htb

[Alexandru Matei]

Peter Surda wrote:

> at.matei schrieb:
>
>> Hi all, 
>
>
> hi
>
>> Can I use wrr with 8 classes each as leaf for each htb child?
>
>
> Yes, but ESFQ may be better. I had stability problems when using more 
> than 1 WRR per interface, but it is possible that it's fixed now. 
> Furthermore, WRR is designed for large numbers so it is an overkill in 
> your situation.
>
>> Or, simply said: will each wrr classifier work on all seen ip 
>> addresses or just the addresses from its htb parent.
>
>
> Any seen IP, they are assigned dynamically. If there are too many, the 
> classes are "recycled" in a LIFO.
>
Ok, maybe I was not clear enough. What I'm interested in is the order of 
passing throught filters. WRR has an built-in filter. HTB child classes 
are fed by matching certain ip addresses (in my case htb chlid1 is for 
x.x.x.0/29, htb  child2 is for x.x.x.8/29 ) and so on. I want  to attach 
wrr1 as child to htb child 1 so the traffic get even divided between 
clients x.x.x.0/29, wrr2 as child to htb child 2 and so on.
What I don't know is:
1/ tc filter match for is evaluated first
2/ if wrr1 is going to classify only hosts seen in x.x.x.0/29 or all 
hosts  x.x.x.0/24

Regards,
Alex

>> Thnaks for any comments,
>
>
> NP.
>
>> Alex
>
>
> Yours sincerely,
> Peter
>
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Re: [LARTC] multiple wrr as child of htb

[Alexandru Matei]

Thanks all for your answer. I'll see how it will behave in practice and 
let you know.
Thanks again,
Alex
Peter Surda wrote:

> Alexandru Matei schrieb:
>
>> Ok, maybe I was not clear enough.
>
>
> Yes you were :-)
>
>> What I'm interested in is the order of passing throught filters. WRR 
>> has an built-in filter.
>
>
> Yes. But this isn't anything special per se, any classful qdisc 
> distributes packets somehow, you just usually "tune" it by using tc 
> filter.
>
>> HTB child classes are fed by matching certain ip addresses (in my 
>> case htb chlid1 is for x.x.x.0/29, htb  child2 is for x.x.x.8/29 ) 
>> and so on.
>
>
> Yes.
>
>> I want  to attach wrr1 as child to htb child 1 so the traffic get 
>> even divided between clients x.x.x.0/29, wrr2 as child to htb child 2 
>> and so on.
>
>
> That isn't a problem (other than potential stability issues I 
> mentioned before).
>
>> What I don't know is:
>> 1/ tc filter match for is evaluated first
>
>
> Of course.
>
>> 2/ if wrr1 is going to classify only hosts seen in x.x.x.0/29 or all 
>> hosts  x.x.x.0/24
>
>
> WRR classifies those packets that "flow" through it, like any other 
> qdisc. It doesn't care whether they are a /29 subnet or some arbitrary 
> IPs (it uses hashing in a way similar to conntrack for assigning 
> classes).
>
>> Regards,
>> Alex
>
>
> Yours sincerely,
> Peter
>
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