Configuring HTB to do shaping for 3000kb/s with 4 bytes overhead. Test shows shaping is done correctly (exact amount of bytes are received including CFS) however when checking TC configuration $overhead$ value is displayed incorrectly showing configuration of 0 bytes
. 
Enter the following commands:
sudo  tc qdisc add dev eth1 root handle 1: htb default 10
sudo  tc class add dev eth1 parent 1: classid 1:10 htb rate 3000kbit burst 10000 cburst 10000 overhead 4
sudo  tc qdisc add dev eth1 parent 1:10 handle 10:0 pfifo limit 10
tc -s -d class show dev eth1

Result:
class htb 1:10 root leaf 10: prio 0 quantum 37500 rate 3000Kbit ceil 3000Kbit burst 9999b/1 mpu 0b overhead 0b cburst 9999b/1 mpu 0b overhead 0b level 0
 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: 416656 ctokens: 416656

uname -a
Linux cto-linux-11 3.13.0-031300-generic #201401192235 SMP Mon Jan 20 03:36:48 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux