[LARTC] tc option rate limits traffic??

[LARTC] tc option rate limits traffic??

[Szalka Tamas]

Hi!

I have a tc ruleset for shaping ingress traffic (with imq):
// root qdisc
tc qdisc add dev imq0 root handle 1 htb default 13
tc class add dev imq0 parent 1: classid 1:2 htb rate 384Kbit ceil 2Mbit 
burst 15k

// www traffic
tc class add dev imq0 parent 1:2 classid 1:11 htb rate 256Kbit ceil 
2Mbit burst 15k
tc qdisc add dev imq0 parent 1:11 handle 11 sfq perturb 10
tc filter add dev imq0 parent 1:0 protocol ip prio 100 u32 match ip 
sport 80 0xffff match ip dst 10.0.8.0/24 classid 1:11

// default class
tc class add dev imq0 parent 1:2 classid 1:13 htb rate 56Kbit ceil 2Mbit 
burst 15k
tc qdisc add dev imq0 parent 1:13 handle 13 sfq perturb 10

I can download only with ~40 Kbyte/s (~256Kbit), as if the RATE 
parameter gives a limit for downloading, not a guaranteed bandwidth... 
The tc should give the total 2Mbit bandwidth, while there's no other 
traffic on the link.
Have you experienced similar?

Tom

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Re: [LARTC] tc option rate limits traffic??

[Stef Coene]

On Monday 20 October 2003 18:04, Szalka Tamas wrote:
> Hi!
>
> I have a tc ruleset for shaping ingress traffic (with imq):
> // root qdisc
> tc qdisc add dev imq0 root handle 1 htb default 13
> tc class add dev imq0 parent 1: classid 1:2 htb rate 384Kbit ceil 2Mbit
> burst 15k
>
> // www traffic
> tc class add dev imq0 parent 1:2 classid 1:11 htb rate 256Kbit ceil
> 2Mbit burst 15k
> tc qdisc add dev imq0 parent 1:11 handle 11 sfq perturb 10
> tc filter add dev imq0 parent 1:0 protocol ip prio 100 u32 match ip
> sport 80 0xffff match ip dst 10.0.8.0/24 classid 1:11
>
> // default class
> tc class add dev imq0 parent 1:2 classid 1:13 htb rate 56Kbit ceil 2Mbit
> burst 15k
> tc qdisc add dev imq0 parent 1:13 handle 13 sfq perturb 10
>
> I can download only with ~40 Kbyte/s (~256Kbit), as if the RATE
> parameter gives a limit for downloading, not a guaranteed bandwidth...
> The tc should give the total 2Mbit bandwidth, while there's no other
> traffic on the link.
> Have you experienced similar?
Try to remove the burst parameter.

Stef

-- 
stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net

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