Re: tc and priority

[Fabio Marcone <fabio.marcone@duet.it>]

Hi,
I test this script:
#!/bin/bash

tc qdisc del dev eth0 root
iptables -P INPUT ACCEPT

tc qdisc add dev eth0 root handle 1: prio bands 3
tc qdisc add dev eth0 parent 1:1 handle 2 sfq perturb 10
tc qdisc add dev eth0 parent 1:2 handle 3 sfq perturb 10
tc qdisc add dev eth0 parent 1:3 handle 4 sfq perturb 10
#tc filter add dev eth0 protocol ip parent 1: prio 1 u32 match ip sport 
80 0xffff flowid 1:1
##tc filter add dev eth0 protocol ip parent 1: prio 2 <your 
criteria_middle> flowid 1:2
#tc filter add dev eth0 protocol ip parent 1: prio 3 u32 match ip sport 
81 0xffff flowid 1:3
tc filter add dev eth0 protocol ip parent 1: prio 1 u32 classid 1:1 
match ip protocol 6 0xFF match ip sport 80 0xFFFF
tc filter add dev eth0 protocol ip parent 1: prio 2 u32 classid 1:3 
match ip protocol 6 0xFF match ip sport 81 0xFFFF
tc filter add dev eth0 protocol ip parent 1: prio 3 u32 match u8 0 0 
flowid 1:2


I run 4 high priority processes (classid 1:1) and 1 low priority one 
(classid 1:3).  These are the result:
high proc1: 19.5K/s
high proc2: 5.71K/s
high proc3: 738B/s
high proc4: 12.8K/s

low proc: 5.8 K/s

I don't undestand: low process didn't stall and a high process used a 
datarate << than low process.


Help, help, help!

Fabio