[LARTC] cbq question

[LARTC] cbq question

[Forstner]

<PRE>Hi all,

I've got following network running:

linux router with 2 NICs and one ISDN card
- the ISDN card is connected to the internet (dialup dynamic ip)
- first NIC subnet 192.168.0.x
- second NIC subnet 192.168.1.x

All computers on both subnets get access to the internet through the linux 
router with NAT
I would like to split the bandwidth for the 2 subnets (4 KB/s for each subnet)
Question: is it possible with tc, because of the limitation for outgoing 
traffic only ?
If possible, can someone please help me ?
Example config ? Tool for creating scripts ? Other ?
THX for any help!

---
Best regards,

Forstner Michael


</PRE>

[LARTC] CBQ question

[Gery Kahn]

Please.
I create simple config.

    CBQ
       |
   class
 |	|
class1   class2

when rate of class1 is high for the rate of class2,
finaly rate of class2 exceed the given.
My experiments gives for example if
class1 rate = 90Mbit and class2 rate = 10Mbit so
actual rate of class2 can be from 11.4 to 12.5 ( and far more ).

Thank you.

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Re: [LARTC] CBQ question

[Juergen]

> Please.
> I create simple config.
>
>     CBQ
>        |
>    class
>  | |
> class1   class2
>
> when rate of class1 is high for the rate of class2,
> finaly rate of class2 exceed the given.
> My experiments gives for example if
> class1 rate = 90Mbit and class2 rate = 10Mbit so
> actual rate of class2 can be from 11.4 to 12.5 ( and far more ).
>
> Thank you.
>
 I test for CBQ and get the same result.
This question I asked before, it's maybe weight, avpkt, cbq problem...
I change the avpkt to 500Kbit(I don't know why???) and get better accuracy,
maybe you can try this.
Another way is change your queueing disciplines(cbq) to tbf, it's really
more stable than cbq, it won't get jitter when your avpkt is change.



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Re: [LARTC] CBQ question

[Stef Coene]

Gery Kahn wrote:
> 
> Please.
> I create simple config.
> 
>     CBQ
>        |
>    class
>  |      |
> class1   class2
> 
> when rate of class1 is high for the rate of class2,
> finaly rate of class2 exceed the given.
> My experiments gives for example if
> class1 rate = 90Mbit and class2 rate = 10Mbit so
> actual rate of class2 can be from 11.4 to 12.5 ( and far more ).

I tested it also and when you give 1 class more than 75% of bandwidth,
it gets less than that.  I have tests-results on  my website to prove
it.

A better setup is this :

      CBQ
       |
     class
       |
     qdisc
   |        |
 class1   class2
 

-- 

Stef

More QOS info : http://users.belgacom.net/staf/


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Re: [LARTC] CBQ question

[Stef Coene]

Gery Kahn wrote:
> 
> Please.
> I create simple config.
> 
>     CBQ
>        |
>    class
>  |      |
> class1   class2
> 
> when rate of class1 is high for the rate of class2,
> finaly rate of class2 exceed the given.
> My experiments gives for example if
> class1 rate = 90Mbit and class2 rate = 10Mbit so
> actual rate of class2 can be from 11.4 to 12.5 ( and far more ).

I tested it also and when you give 1 class more than 75% of bandwidth,
it gets less than that.  I have tests-results on  my website to prove
it.

A better setup is this :

      CBQ
       |
     class
       |
     qdisc
   |        |
 class1   class2
 

-- 

Stef

More QOS info : http://users.belgacom.net/staf/

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RE: [LARTC] CBQ question

[Gery Kahn]

It seems that configuration like
      qdisc(CBQ)
       |
     class
   |		|
 class1   class2
 bounded  bounded

doesn't work perfect.The more stable ( accurate ) configuration would be
    qdisc(cbq) 1:0
	|
    class 1:1
	|
    qdisc(cbq) 2:0
    |          |
  class 2:1  class 2:2
    |
  qdisc(tbf) 3:0
Now when class 2:1 have rate 10Mbit and class 2:2 = 70Mbit
i can have 9.05 and 72.774

> Please.
> I create simple config.
>
>     CBQ
>        |
>    class
>  | |
> class1   class2
>
> when rate of class1 is high for the rate of class2,
> finaly rate of class2 exceed the given.
> My experiments gives for example if
> class1 rate = 90Mbit and class2 rate = 10Mbit so
> actual rate of class2 can be from 11.4 to 12.5 ( and far more ).
>
> Thank you.
>
 I test for CBQ and get the same result.
This question I asked before, it's maybe weight, avpkt, cbq problem...
I change the avpkt to 500Kbit(I don't know why???) and get better accuracy,
maybe you can try this.
Another way is change your queueing disciplines(cbq) to tbf, it's really
more stable than cbq, it won't get jitter when your avpkt is change.


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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/

Re: [LARTC] CBQ question

[Juergen]

> It seems that configuration like
>       qdisc(CBQ)
>        |
>      class
>    | |
>  class1   class2
>  bounded  bounded
>
> doesn't work perfect.The more stable ( accurate ) configuration would be
>     qdisc(cbq) 1:0
> |
>     class 1:1
> |
>     qdisc(cbq) 2:0
>     |          |
>   class 2:1  class 2:2
>     |
>   qdisc(tbf) 3:0
> Now when class 2:1 have rate 10Mbit and class 2:2 = 70Mbit
> i can have 9.05 and 72.774
>

I want to do it and make a config

----------------------------------------------------------------------------
--------------------
BANDWIDTH="bandwidth 10Mbit"
RATE="rate 2Mbit"
DEV="dev eth1"
AVP="avpkt 1000"

tc qdisc add $DEV root handle 10: cbq $BANDWIDTH $AVP

tc class add $DEV parent 10:0 classid 10:1 cbq $BANDWIDTH $RATE \
allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
bounded

tc qdisc add $DEV parent 10:1 handle 20: cbq bandwidth 2Mbit $AVP

tc class add $DEV parent 20:0 classid 20:1 cbq bandwidth 2Mbit $RATE \
allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
bounded


tc filter add $DEV parent 20:0 protocol ip prio 100 u32 match ip src \
$IP flowid 20:1
----------------------------------------------------------------------------
--------------------
but it's not active....the bandwidth is still 10Mbit....
Is my config's error?????


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RE: [LARTC] CBQ question

[Gery Kahn]

Just add one more qdisc

tc qdisc add dev eth1 parent 20:1 tbf rate 2Mbit buffer 30Kb/8 limit 15Kb


-----Original Message-----
From: Juergen [mailto:lchou@staff.pccu.edu.tw]
Sent: Monday, May 14, 2001 5:02 AM
To: Gery Kahn
Cc: lartc@mailman.ds9a.nl
Subject: Re: [LARTC] CBQ question




> It seems that configuration like
>       qdisc(CBQ)
>        |
>      class
>    | |
>  class1   class2
>  bounded  bounded
>
> doesn't work perfect.The more stable ( accurate ) configuration would be
>     qdisc(cbq) 1:0
> |
>     class 1:1
> |
>     qdisc(cbq) 2:0
>     |          |
>   class 2:1  class 2:2
>     |
>   qdisc(tbf) 3:0
> Now when class 2:1 have rate 10Mbit and class 2:2 = 70Mbit
> i can have 9.05 and 72.774
>

I want to do it and make a config

----------------------------------------------------------------------------
--------------------
BANDWIDTH="bandwidth 10Mbit"
RATE="rate 2Mbit"
DEV="dev eth1"
AVP="avpkt 1000"

tc qdisc add $DEV root handle 10: cbq $BANDWIDTH $AVP

tc class add $DEV parent 10:0 classid 10:1 cbq $BANDWIDTH $RATE \
allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
bounded

tc qdisc add $DEV parent 10:1 handle 20: cbq bandwidth 2Mbit $AVP

tc class add $DEV parent 20:0 classid 20:1 cbq bandwidth 2Mbit $RATE \
allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
bounded


tc filter add $DEV parent 20:0 protocol ip prio 100 u32 match ip src \
$IP flowid 20:1
----------------------------------------------------------------------------
--------------------
but it's not active....the bandwidth is still 10Mbit....
Is my config's error?????

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Re: [LARTC] CBQ question

[Juergen]

> Just add one more qdisc
>
> tc qdisc add dev eth1 parent 20:1 tbf rate 2Mbit buffer 30Kb/8 limit 15Kb

But I just want to use cbq to bound my bandwidth.
In classid 20:1 should have been limit to 2Mbit (I guess...), but not
active.
Or I have to add a tbf in this config???????
If I have to use tbf, I can just use tbf to limit my bandwidth without cbq
and it's also work....right??????

> >     qdisc(cbq) 1:0
> > |
> >     class 1:1
> > |
> >     qdisc(cbq) 2:0
> >     |          |
> >   class 2:1  class 2:2
> >     |
> >   qdisc(tbf) 3:0
> > Now when class 2:1 have rate 10Mbit and class 2:2 = 70Mbit
> > i can have 9.05 and 72.774
> >
>
> I want to do it and make a config
>
> --------------------------------------------------------------------------
--
> --------------------
> BANDWIDTH="bandwidth 10Mbit"
> RATE="rate 2Mbit"
> DEV="dev eth1"
> AVP="avpkt 1000"
>
> tc qdisc add $DEV root handle 10: cbq $BANDWIDTH $AVP
>
> tc class add $DEV parent 10:0 classid 10:1 cbq $BANDWIDTH $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
>
> tc qdisc add $DEV parent 10:1 handle 20: cbq bandwidth 2Mbit $AVP
>
> tc class add $DEV parent 20:0 classid 20:1 cbq bandwidth 2Mbit $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
>
>
> tc filter add $DEV parent 20:0 protocol ip prio 100 u32 match ip src \
> $IP flowid 20:1
> --------------------------------------------------------------------------
--
> --------------------
> but it's not active....the bandwidth is still 10Mbit....
> Is my config's error?????
>
> _______________________________________________
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> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO:
http://ds9a.nl/2.4Routing/
>


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Re: [LARTC] CBQ question

[Stef Coene]

> ----------------------------------------------------------------------------
> --------------------
> BANDWIDTH="bandwidth 10Mbit"
> RATE="rate 2Mbit"
> DEV="dev eth1"
> AVP="avpkt 1000"
> 
> tc qdisc add $DEV root handle 10: cbq $BANDWIDTH $AVP
> 
> tc class add $DEV parent 10:0 classid 10:1 cbq $BANDWIDTH $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
> 
> tc qdisc add $DEV parent 10:1 handle 20: cbq bandwidth 2Mbit $AVP
> 
> tc class add $DEV parent 20:0 classid 20:1 cbq bandwidth 2Mbit $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
> 
> tc filter add $DEV parent 20:0 protocol ip prio 100 u32 match ip src \
> $IP flowid 20:1
> ----------------------------------------------------------------------------
> --------------------
> but it's not active....the bandwidth is still 10Mbit....
> Is my config's error?????
You miss a filter 

tc filter add $DEV parent 10:0 protocol ip prio 100 u32 match ip src $IP
flowid 10:1

Stef


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Re: [LARTC] CBQ question

[Stef Coene]

> ----------------------------------------------------------------------------
> --------------------
> BANDWIDTH="bandwidth 10Mbit"
> RATE="rate 2Mbit"
> DEV="dev eth1"
> AVP="avpkt 1000"
> 
> tc qdisc add $DEV root handle 10: cbq $BANDWIDTH $AVP
> 
> tc class add $DEV parent 10:0 classid 10:1 cbq $BANDWIDTH $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
> 
> tc qdisc add $DEV parent 10:1 handle 20: cbq bandwidth 2Mbit $AVP
> 
> tc class add $DEV parent 20:0 classid 20:1 cbq bandwidth 2Mbit $RATE \
> allot 1514 weight 200Kbit prio 5 maxburst 20 $AVP \
> bounded
> 
> tc filter add $DEV parent 20:0 protocol ip prio 100 u32 match ip src \
> $IP flowid 20:1
> ----------------------------------------------------------------------------
> --------------------
> but it's not active....the bandwidth is still 10Mbit....
> Is my config's error?????
You miss a filter 

tc filter add $DEV parent 10:0 protocol ip prio 100 u32 match ip src $IP
flowid 10:1

Stef

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