Re: [LARTC] HTB not that exact

[Daniel Ryczek <riczi@elf.silesianet.pl>]

On Thu, Dec 06, 2001 at 08:28:07PM +0100, Stefan Rompf wrote:
> Hi,
> 
> tc qdisc add dev eth0 root handle 1: htb default 3
> 
> tc class add dev eth0 parent 1: classid 1:1 htb rate 20Mbit burst 4kB
> tc qdisc add dev eth0 parent 1:1 sfq
> 
> tc class add dev eth0 parent 1: classid 1:2 htb rate 3Mbit burst 2kB
> tc qdisc add dev eth0 parent 1:2 sfq
> 
> tc class add dev eth0 parent 1: classid 1:3 htb rate 77Mbit burst 150kB
> tc qdisc add dev eth0 parent 1:3 sfq
> 
> tc filter add dev eth0 parent 1:0 prio 7 protocol ip handle 1 fw classid
> 1:1
> tc filter add dev eth0 parent 1:0 prio 7 protocol ip handle 2 fw classid
> 1:2
> 
> /usr/local/sbin/iptables -t mangle -F OUTPUT
> /usr/local/sbin/iptables -t mangle -A OUTPUT -p tcp --dport 9021 -j MARK
> --set-mark 1
> /usr/local/sbin/iptables -t mangle -A OUTPUT -p tcp --dport 9022:9023 -j
> MARK --set-mark 2
> 
> The network adaptor is connected to a 100MBit switch. When testing with
> netio, I can send up to 370kB/sec through class 1:2 and up to 2,4MB/sec
> via class 1:1, both measured by one/multiple instances of netio and the
> rate output of "tc -s class dev eth0". This effect occurs with Linux
> 2.4.16,  kernel either compiled with HZ set to 100 or 1024, and of
> course independant of the filter type used. During the tests, no packets
> need to be dropped, htb just delays.
I think your results are quite exact. The difference is because of
different units. 
370kB = 370 * 8 = 2.96 Mbit
2.4MB = 19.2 Mbit

--
Daniel


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