[LARTC] police rate doesn't work ?

[Andy Furniss]

Vitale Alessandro wrote:
> I would like to test police in ingress.
> I use kernel 2.4.20.

FWIW if you try a 2.6 whether or not policers will see marks will depend 
on your config - Packet action will give a new policer that hooks before 
netfilter.

> I use this configuration:
> 
> iptables -t mangle -A PREROUTING -i eth0 -s 10.31.12.2 -d 10.31.11.2 -p udp --dport 1001 -j MARK --set-mark 1
> iptables -t mangle -A PREROUTING -i eth0 -s 10.31.12.2 -d 10.31.11.2 -p udp --dport 1002 -j MARK --set-mark 2
> iptables -t mangle -A PREROUTING -i eth0 -s 10.31.12.2 -d 10.31.11.2 -p udp --dport 1003 -j MARK --set-mark 3
> iptables -t mangle -A PREROUTING -i eth0 -s 10.31.12.2 -d 10.31.11.2 -p udp --dport 1004 -j MARK --set-mark 4
> 
> tc qdisc add dev eth0 handle ffff: ingress
> tc filter add dev eth0 parent ffff: protocol ip prio 1 handle 1 fw police rate 2500000 burst 90k drop
> tc filter add dev eth0 parent ffff: protocol ip prio 1 handle 2 fw police rate 1500000 burst 90k drop
> tc filter add dev eth0 parent ffff: protocol ip prio 1 handle 3 fw police rate 1000000 burst 90k drop
> 
> 
> I generate traffic with smartbits and i made this test:
> 1)len packet layer2 64 byte,

Is that actually possible on eth?

  packets per second 5500 = 2810000 bit per second
> 2)len packet layer2 1000 byte, packets per second 350 = 2800000 bit per second
> 
> The 2 test is good i receive a trafiic with 2500000 rate limit !
> The problem is with 1 test because i received full band 2810000 without any limit!
> 
> Is there any problem with police rate? It doesn't work  with small packets?
> I've to set some other usefull parameter?

On eth shapers/policers will see packets as ip length +14 but there are 
more overheads/mpu.

Currently you can't specify mpu/overhead for policers, It may be added 
soon - but that will be 2.6s I guess.

Andy.