Re: question on fwmark speed boost

[Andy Furniss <adf.lists@gmail.com>]

Wolfgang Hennerbichler wrote:
> Follow-Up: This is the only pice of information I have found on my problem:
>
> http://marc.info/?l=lartc&m\x105421129231583&w=2
>
> => You can reduce the number of fw filters rules if you use the mark as
> hash key.
> So if you add
> tc filter add dev eth0 parent 1:0 protocol ip handle 1 fw
> and you have a packet with mark 39, it will placed in class 1:39.

OK, so after saying I've never done this I remembered I had long ago and 
found a test :-)

Using "handle 1" seems to get the filter rejected - but the main thing 
is the way you have to mark to match the first part of your classid -

tc qdisc add dev eth0 root handle 1: htb
tc class add dev eth0 parent 1: classid 1:a htb rate 1mbit
tc class add dev eth0 parent 1: classid 1:b htb rate 1mbit
tc class add dev eth0 parent 1: classid 1:c htb rate 1mbit
tc filter add dev eth0 parent 1:0 protocol ip fw

iptables -t mangle -I OUTPUT -o eth0 -p tcp -j MARK --set-mark 0x1000a
iptables -t mangle -I OUTPUT -o eth0 -p icmp -j MARK --set-mark 0x1000b
iptables -t mangle -I OUTPUT -o eth0 -p udp -j MARK --set-mark 0x1000c


ph4[/home/andy]# iptables -L OUTPUT -vnt mangle

Chain OUTPUT (policy ACCEPT 84 packets, 14747 bytes)
  pkts bytes target     prot opt in     out     source 
destination
     3   196 MARK       udp  --  *      eth0    0.0.0.0/0 
0.0.0.0/0            MARK set 0x1000c
     7   588 MARK       icmp --  *      eth0    0.0.0.0/0 
0.0.0.0/0            MARK set 0x1000b
    74 13963 MARK       tcp  --  *      eth0    0.0.0.0/0 
0.0.0.0/0            MARK set 0x1000a


ph4[/home/andy]# tc -s class ls dev eth0

class htb 1:c root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
  Sent 238 bytes 3 pkt (dropped 0, overlimits 0 requeues 0)
  rate 0bit 0pps backlog 0b 0p requeues 0
  lended: 3 borrowed: 0 giants: 0
  tokens: 346750 ctokens: 346750

class htb 1:a root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
  Sent 14999 bytes 74 pkt (dropped 0, overlimits 0 requeues 0)
  rate 32bit 0pps backlog 0b 0p requeues 0
  lended: 74 borrowed: 0 giants: 0
  tokens: 348000 ctokens: 348000

class htb 1:b root prio 0 rate 1000Kbit ceil 1000Kbit burst 2850b cburst 
2850b
  Sent 686 bytes 7 pkt (dropped 0, overlimits 0 requeues 0)
  rate 0bit 0pps backlog 0b 0p requeues 0
  lended: 7 borrowed: 0 giants: 0
  tokens: 344000 ctokens: 344000