Re: [LARTC] HTB - unexpected bahaviour

[Martin Devera <devik@cdi.cz>]

I didn't read carefuly but it seems as most common problem - you
have to shape to smaller (by say 5%) rate than your ISP link is.
devik

On Tue, 21 May 2002, Rados³aw Majkut wrote:

> Hi,
> I use HTB to shape incoming traffic from internet to my internal
> network. I want to split traffic into 2 flows: to my box (behind the linux box) and
> to all other users. The Linux box comes with kernel 2.4.18 and HTB v. 2. My setup looks like
> this:
>
>
> tc qdisc del dev eth0 root
> tc qdisc add dev eth0 root handle 1: htb default 10
>
>
> #       Local traffic
>
> tc class add dev eth0 parent 1: classid 1:3 htb rate 30mbit ceil 60mbit burst 1000k
>
>
> #       Internet (whole)
>
> tc class add dev eth0 parent 1: classid 1:2 htb rate 2000kbit ceil 2000kbit burst 15k
>
> #       Internet (everyone except my IP)
>
> tc class add dev eth0 parent 1:2 classid 1:10 htb rate 300kbit ceil 1500kbit burst 5k
> tc qdisc add dev eth0 parent 1:10 handle 10: sfq perturb 10 quantum 1500
>
> #       Internet (my IP)
>
> tc class add dev eth0 parent 1:2 classid 1:11 htb rate 400kbit ceil 1500kbit burst 5k
> tc qdisc add dev eth0 parent 1:11 handle 20: sfq perturb 10 quantum 1500
>
>
>
> So it should be sthg like this:
>
>                  1:
>                 |  |
>                |    |
>               |      |
>              1:2     1:3
>             |   |
>            |     |
>           |       |
>         1:10     1:11
>
>
> I omitted the filters because they work just fine, directing traffic
> to appropriate classes. The trouble is that the traffic distribution
> is strange: the rate and ceil parameters don't behave the way I think
> they should. The throughput of class 1:11 is smaller than the rate
> parameter, it only works when I decrease ceil parameter of class 1:10
> to something like 300kbit - then class 1:11 get its rate or more.
> Plus, the ceil parameter in class 1:2 doesn't seen to work - when I
> set rate to 800kbit it can't go any faster, just as if rate was the
> limit
>
> This is my tc -s class show dev eth0  output:
>
> class htb 1:11 parent 1:2 leaf 20: prio 0 rate 400Kbit ceil 1500Kbit burst 5Kb cburst 3519b
>  Sent 6723692 bytes 4557 pkts (dropped 0, overlimits 53)
>  rate 30219bps 20pps
>  lended: 4364 borrowed: 193 giants: 0 injects: 0
>  tokens: 3080 ctokens: 8568
>
> class htb 1:10 parent 1:2 leaf 10: prio 0 rate 300Kbit ceil 1500Kbit burst 5Kb cburst 3519b
>  Sent 20456108 bytes 17579 pkts (dropped 0, overlimits 4496)
>  rate 82087bps 74pps
>  lended: 7502 borrowed: 10077 giants: 0 injects: 0
>  tokens: 97280 ctokens: 12630
>
> class htb 1:2 root prio 0 rate 2000Kbit ceil 2000Kbit burst 15Kb cburst 4159b
>  Sent 27376137 bytes 22934 pkts (dropped 0, overlimits 0)
>  rate 112478bps 97pps
>  lended: 10466 borrowed: 0 giants: 0 injects: 0
>  tokens: 44314 ctokens: 8473
>
> But when I set ceil of class 1:10 to 300kbit, it looks totally
> different - class 1:11 gets it fair share or even more:
>
> class htb 1:11 parent 1:2 leaf 20: prio 0 rate 400Kbit ceil 1500Kbit burst 5Kb cburst 3519b
>  Sent 5324008 bytes 3604 pkts (dropped 0, overlimits 0)
>  rate 68027bps 46pps
>  lended: 2444 borrowed: 1160 giants: 0 injects: 0
>  tokens: -3042 ctokens: 8568
>
> class htb 1:10 parent 1:2 leaf 10: prio 0 rate 300Kbit ceil 300Kbit burst 5Kb cburst 1983b
>  Sent 3227721 bytes 3850 pkts (dropped 0, overlimits 8700)
>  rate 37434bps 44pps backlog 53p
>  lended: 3797 borrowed: 0 giants: 0 injects: 0
>  tokens: 35336 ctokens: -31566
>
> class htb 1:2 root prio 0 rate 2000Kbit ceil 2000Kbit burst 15Kb cburst 4159b
>  Sent 8525779 bytes 7593 pkts (dropped 0, overlimits 0)
>  rate 104106bps 91pps
>  lended: 1160 borrowed: 0 giants: 0 injects: 0
>  tokens: 42830 ctokens: 6989
>
> What's is the problem? Have I overlooked something?
> Thanks in advance
>
> --
> greetz
> Radek Majkut
> rahdeck@interia.pl
>
>
>
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