[LARTC] tc doesn't shape correct

[LARTC] tc doesn't shape correct

[Johan Huysmans]

Hi All,

I'm configuring my natting-firewall to do some tc shaping. Some traffic 
has to be shaped on 30mbit, some on 10mbit all the others are unlimited.
The configuring  and filtering works correctly. The traffic that is 
shaped at 30mbit is correct, but the traffic that is shapped at 10mbit 
only gets to 100KB/sec.

It is on a device configured with bonding (both in and out interface).

Any clue why shaped traffic at 10mbit only gets to 100KB/sec and not faster?

Thx for any response,
Johan Huysmans
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Re: [LARTC] tc doesn't shape correct

[Johan Huysmans]

Here is my tc config, maybe something is wrong with that config:

/sbin/tc qdisc  del dev bond1 root
/sbin/tc qdisc  add dev bond1 root handle 1: htb default 1
/sbin/tc class  add dev bond1 parent 1: classid 1:1 htb rate 1000mbit burst 1310720
/sbin/tc class  add dev bond1 parent 1: classid 1:2 htb rate 30mbit burst 39321
/sbin/tc class  add dev bond1 parent 1: classid 1:3 htb rate 10mbit burst 13107
/sbin/tc filter add dev bond1 parent 1: protocol ip prio 0 handle 1 fw flowid 1:2
/sbin/tc filter add dev bond1 parent 1: protocol ip prio 0 handle 2 fw flowid 1:3


Any help appreciated!

Johan Huysmans wrote:
> Hi All,
>
> I'm configuring my natting-firewall to do some tc shaping. Some 
> traffic has to be shaped on 30mbit, some on 10mbit all the others are 
> unlimited.
> The configuring  and filtering works correctly. The traffic that is 
> shaped at 30mbit is correct, but the traffic that is shapped at 10mbit 
> only gets to 100KB/sec.
>
> It is on a device configured with bonding (both in and out interface).
>
> Any clue why shaped traffic at 10mbit only gets to 100KB/sec and not 
> faster?
>
> Thx for any response,
> Johan Huysmans
> _______________________________________________
> LARTC mailing list
> LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
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Re: [LARTC] tc doesn't shape correct

[Stanislav Kruchinin]

Johan Huysmans wrote:
> Here is my tc config, maybe something is wrong with that config:
> 
> /sbin/tc qdisc  del dev bond1 root
> /sbin/tc qdisc  add dev bond1 root handle 1: htb default 1
> /sbin/tc class  add dev bond1 parent 1: classid 1:1 htb rate 1000mbit
> burst 1310720
> /sbin/tc class  add dev bond1 parent 1: classid 1:2 htb rate 30mbit
> burst 39321
> /sbin/tc class  add dev bond1 parent 1: classid 1:3 htb rate 10mbit
> burst 13107

I think you should try to set "quantum" parameter of all leaf classes to
the value at least as high as MTU, e.g. 1500 for Ethernet, and to
increase the burst of 1:3 class.
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Re: [LARTC] tc doesn't shape correct

[Johan Huysmans]

none of these changes corrected my problem.

Stanislav Kruchinin wrote:
> Johan Huysmans wrote:
>   
>> Here is my tc config, maybe something is wrong with that config:
>>
>> /sbin/tc qdisc  del dev bond1 root
>> /sbin/tc qdisc  add dev bond1 root handle 1: htb default 1
>> /sbin/tc class  add dev bond1 parent 1: classid 1:1 htb rate 1000mbit
>> burst 1310720
>> /sbin/tc class  add dev bond1 parent 1: classid 1:2 htb rate 30mbit
>> burst 39321
>> /sbin/tc class  add dev bond1 parent 1: classid 1:3 htb rate 10mbit
>> burst 13107
>>     
>
> I think you should try to set "quantum" parameter of all leaf classes to
> the value at least as high as MTU, e.g. 1500 for Ethernet, and to
> increase the burst of 1:3 class.
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> LARTC mailing list
> LARTC@mailman.ds9a.nl
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>   
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Re: [LARTC] tc doesn't shape correct

[Andy Furniss]

Johan Huysmans wrote:
> Here is my tc config, maybe something is wrong with that config:
> 
> /sbin/tc qdisc  del dev bond1 root

I would see if it's the same on normal eth and/or try using child queues 
on the classes - htb may be using a very small queuelen because there is 
no default queue on the bond.

> /sbin/tc qdisc  add dev bond1 root handle 1: htb default 1
> /sbin/tc class  add dev bond1 parent 1: classid 1:1 htb rate 1000mbit 
> burst 1310720

This isn't really shaping anyway (rate 1000 is too high because of 
overheads) so I would use default 0 (or don't specify) which means 
unclassified traffic goes unshaped. HTB default also catches arp which 
is worth considering.

There could be other reasons - timers maybe, or if your nic uses tcp 
segmentation offload then locally generated tcp may go through a super 
sized packets - this makes htb underlimit them and shows a giants on the 
output of -

tc -s class ls dev ..

you can turn TSO off with ethtool -k

On the filters prio 0 is not the highest 1 is, thouh it won't matter here.

Andy.


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