HTB - Rate errors

Linux Advanced Routing and Traffic Control

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Hi,

I'm trying to get HTB working correctly on Centos4 (RHEL-based) with
kernel 2.6.9-34.EL. I have two gigabit network interfaces bridged
together and I have created the following: 

tc qdisc add dev eth2 root handle 1: htb default 1 r2q 8000
tc class add dev eth2 parent 1: classid 1:1 htb rate 100Mbit burst 24k
cburst 24k

(I have been trying different parameters).

The network is passing ~80MBits of traffic but HTB is not seeing the
rate correctly (which obviously causes problems when I try to shape a
sub-set of the traffic). These are approx 1 second apart:

[root@ ~]# tc -s -d class sh dev eth2
class htb 1:1 root prio 0 quantum 1562 rate 100Mbit ceil 100Mbit burst
24Kb/8 mpu 0b overhead 0b cburst 24Kb/8 mpu 0b overhead 0b level 0
 Sent 654872932 bytes 830973 pkts (dropped 0, overlimits 0 requeues 0)
 rate 7827086bit 9941pps
 lended: 830973 borrowed: 0 giants: 0
 tokens: 1479 ctokens: 1479

[root@ ~]# tc -s -d class sh dev eth2
class htb 1:1 root prio 0 quantum 1562 rate 100Mbit ceil 100Mbit burst
24Kb/8 mpu 0b overhead 0b cburst 24Kb/8 mpu 0b overhead 0b level 0
 Sent 663902498 bytes 842747 pkts (dropped 0, overlimits 0 requeues 0)
 rate 7827086bit 9941pps
 lended: 842747 borrowed: 0 giants: 0
 tokens: 1527 ctokens: 1527

That's a transfer of around 9MBytes, yet HTB is only reporting just
under 8Mbits/sec. Has anyone got any suggestions for me to try?

Many thanks,

Luke



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