Weird traffic shaping behavior after kernel upgrade

["Hoggins!" <fuckspam@wheres5.com>]

Hello list,

This is my first post, so please forgive me if my ways are wrong, but
this is an important request for help.

I was running kernel 3.9.10 (Fedora-flavored), and for several reasons,
I needed to upgrade to the last version, 3.12.6. Yeah, it was about time.

Anyway, I really don't know how and where to look for an answer on my
problem, and since the kernel is the only thing that changed on this
machine, I suspect there has to be something with it.

I have the feeling that my traffic shaping is not working exactly as
expected anymore. I use it to "regulate" low-throughput (xDSL)
connections, and it was working great until now, but since I upgraded, I
feel that the experience is not as "fluid" as it used to be.

And I was surprised to see the following output :

---- SNIP ----
$ tc -s class show dev ppp0

class htb 1:11 parent 1:1 prio 0 rate 200000bit ceil 800000bit burst
1492b cburst 1492b
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 932500 ctokens: 233125

class htb 1:1 root rate 800000bit ceil 800000bit burst 1492b cburst 1492b
 Sent 293785084 bytes 341228 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
 lended: 223981 borrowed: 0 giants: 0
 tokens: 26875 ctokens: 26875

class htb 1:13 parent 1:1 prio 1 rate 200000bit ceil 200000bit burst
1492b cburst 1492b
 Sent 5746052 bytes 25213 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
 lended: 25213 borrowed: 0 giants: 0
 tokens: 832500 ctokens: 832500

class htb 1:12 parent 1:1 leaf 12: prio 2 rate 100000bit ceil 160000bit
burst 1492b cburst 1492b
 Sent 66792 bytes 1253 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
 lended: 1253 borrowed: 0 giants: 0
 tokens: 1693898 ctokens: 1067648

class htb 1:15 parent 1:1 prio 1 rate 50000bit ceil 50000bit burst 1492b
cburst 1492b
 Sent 25153220 bytes 32605 pkt (dropped 6, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 0p requeues 0
 lended: 32605 borrowed: 0 giants: 0
 tokens: -132903 ctokens: -132903

class htb 1:14 parent 1:1 leaf 14: prio 3 rate 80000bit ceil 400000bit
burst 1492b cburst 1492b
 Sent 262819020 bytes 282157 pkt (dropped 0, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 0b 5p requeues 0
 lended: 58178 borrowed: 223981 giants: 0
 tokens: -1062034 ctokens: -412442

---- SNIP ----

What worries me is that the "rate" values are always zeroed, even when
under heavy traffic. It's not the case with the older version of the kernel.

So I was wondering if there was something I missed, and needed to update
in my traffic shaping script. Here it is :

---- SNIP ----

${TC} qdisc del dev ${IF} root
${TC} qdisc add dev ${IF} root handle 1: htb default 14
${TC} class add dev ${IF} parent 1: classid 1:1 htb rate ${MAX}kbps ceil
${MAX}kbps prio 0 mtu ${MTU}

# Vers TheDude
${TC} class add dev ${IF} parent 1:1 classid 1:11 htb rate 200kbit ceil
${MAX}kbps prio 0 mtu ${MTU}

# Paquets ACK
${TC} class add dev ${IF} parent 1:1 classid 1:12 htb rate 100kbit ceil
160kbit prio 2 mtu ${MTU}

# Téléphone
${TC} class add dev ${IF} parent 1:1 classid 1:13 htb rate 200kbit ceil
200kbit prio 1 mtu ${MTU}

# Traffic général
${TC} class add dev ${IF} parent 1:1 classid 1:14 htb rate 80kbit ceil
400kbit prio 3 mtu ${MTU}

# Vers Duplex
${TC} class add dev ${IF} parent 1:1 classid 1:15 htb rate 50kbit ceil
50kbit prio 1 mtu ${MTU}

${TC} qdisc add dev ${IF} parent 1:12 handle 12: sfq perturb 10
${TC} qdisc add dev ${IF} parent 1:14 handle 14: sfq perturb 10

${TC} filter add dev ${IF} protocol ip parent 1:0 handle 2 fw classid 1:11
${TC} filter add dev ${IF} protocol ip parent 1:0 handle 3 fw classid 1:12
${TC} filter add dev ${IF} protocol ip parent 1:0 handle 4 fw classid 1:13
${TC} filter add dev ${IF} protocol ip parent 1:0 handle 5 fw classid 1:14
${TC} filter add dev ${IF} protocol ip parent 1:0 handle 6 fw classid 1:15

---- SNIP ----

The packet MARKing in iptables is working as expected, as the counters
successfully increase over time.

I'm really stuck, and I need your help.

Happy New Year, and thanks in advance !

    Hoggins!