Re: [LARTC] Priorizing bandwidth share

[Stef Coene <stef.coene@docum.org>]

On Monday 13 October 2003 08:07, Nguyen Dang Phuoc Dong wrote:
> Hi folks,
>
> I have tested Priorizing bandwidth share feature of HTB and it results very
> bad.
>
> My test environment is something like below. There only 2 PCs on my LAN
>
> Internet
>
> ADSL
>
>     | eth1
>
> Linux box (iptables + HTB)
>
>     | eth0 (192.168.1.254)
>
> ----------------------------
>
>     |        LAN          |
>
> PC1                      PC2
> (192.168.1.1)     (192.168.1.2)
>
> My ADSL is 512K up/down. Infact, the real bandwidth is about 450K in almost
> time.
>
> Below is my tc script:
>
> /bin/tc qdisc del dev eth0 root
> tc qdisc add dev eth0 root handle 2: htb r2q 1
> tc class add dev eth0 parent 2: classid 2:1 htb rate 512Kbit ceil 512Kbit
>
> iptables -t mangle -A POSTROUTING -o eth0 -d 192.168.1.1 -j MARK --set-mark
> 12
> iptables -t mangle -A POSTROUTING -o eth0 -d 192.168.1.2 -j MARK --set-mark
> 14
>
> tc class add dev eth0 parent 2:1 classid 2:12 htb rate 400Kbit ceil 512Kbit
> prio 0
> tc qdisc add dev eth0 parent 2:12 sfq
> tc filter add dev eth0 parent 2:0 protocol ip prio 0 handle 12 fw classid
> 2:12
>
> tc class add dev eth0 parent 2:1 classid 2:14 htb rate 100Kbit ceil 512Kbit
> prio 7
> tc qdisc add dev eth0 parent 2:14 sfq
> tc filter add dev eth0 parent 2:0 protocol ip prio 7 handle 14 fw classid
> 2:14
>
> Firstly, I start downloading an iso image from PC1, it can reach 448K. Then
> I start downloading from PC2, then the bandwidth of class 12 (PC1) is down
> to about 216K and bandwidth of class 14 (PC2) is about 220K.
> So it's not what I've expected. Since I set the priority of class 12 ( = 0
> ) higher than priority of class 14 ( = 7 ). In addition, the bandwidth of
> class 12 is assigned 4 time bigger than class 14. As I've expect, class 12
> should be assigned enough bandwidth (400K), and class 14 only get about
> 50K.
>
> I've tried with both HTB2 (I've removed HTB3 code from kernel 2.4.22, and
> patched it with HTB2 source code from HTB home page) and HTB3 (used
> original kernel 2.4.22). The result above is of HTB2. The result of HTB3
> even worse.
>
> Any idea?
Yes.  You said yourself that your link is 450K, so limit all traffic to 445K 
so YOU are the bottleneck and not your ADSL router.
Also, your r2q setting is too low.
And for more htb tests, info and a faq, see www.docum.org.

Stef

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

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