Re: [LARTC] help, strange question about tcp and udp traffic control?

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

On Wednesday 06 November 2002 15:07, lihpc@Legend.com wrote:
> Hi ;
>
>
>
>     +--------+           +-----------+                     +--------+
>
>     | server |---------- | linux box |---------------------| Client |
>
>     +--------+           +-----------+                     +--------+
>
> MY script:
>
> tc-htb3 qdisc del dev eth1 root
> ipchains -F
>
> tc-htb3 qdisc add dev eth1 root handle 10: htb default 20  r2q 40
>
> tc-htb3 class add dev eth1 parent 10: classid 10:1 htb rate 50Mbit   burst
> 2000
>
> tc-htb3 class add dev eth1 parent 10:1 classid 10:100 htb rate 12mbit ceil
> 13mbit prio 1
> tc-htb3 class add dev eth1 parent 10:1 classid 10:20 htb rate 38mbit ceil
> 50Mbit prio 7
>
> ipchains -A fw -s 10.1.1.1 -d 10.1.5.1 -m 100
> ipchains -A fw -s 0.0.0.0 -d 0.0.0.0 -j ACCEPT
>
> tc-htb3 filter add dev eth1 protocol ip parent 10:0 prio 1 handle 100  fw
> classid 10:100
>
>
>
>
> I've find one strange question about traffic control when sending udp data
> and tcp data.
> Could you explain it ? thanks
>
>
> question:
>
> WHEN I measure maximum UDP bandwidth by using "Iperf -1.6 -s -u" in server
> host and "iperf-1.6 -c <server address>  -u  -b 50m" in client host, the
> bandwidth is 12.1mbit.
> OK.  work well.
>
> BUT
> WHEN I measure maximum TCP bandwidth by using"Iperf -1.6 -s " in server
> host and "iperf-1.6 -c <server address>  " in client host, the bandwidth is
> only 3.1mbit.
> WHY ?
I'm not sure, but your burst is way to low.  Can you remove the burst 
parameter from class 10:1 and try again ??
And can you check the tc and ipchains counters so the packets are placed in 
the queue you want ?

Stef

-- 

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

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