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My hardware is a Linksys AP
with MIPS 300MHz and Linux kernel 2.4.20.
The traffics are from two
LAN switch ports to WAN port. And the traffics are generate at a rate of 80Mbit.
So the total traffic to WAN port is 160Mbit. The shaping works well that the
traffic to WAN port is about 50/30Mbit according to configuration. But the
priority seems strange when the root rate is 50Mbit.
When the root ceil is 50Mb and ceil for class 12 and 13
is 50Mb, the actual throughput for class 12 and 13 are 32Mb and 16Mb. But in
theory, class 12 can almost occupy all the 50Mb throughput for it has a higher
priority.
When the root ceil is 30Mb and ceil for class 12 and 13
is 30Mb, HTB works welll that class 12 almost occupies all the 30Mb
throughput.
The output for tc qdisc
show is like the following:
qdisc pfifo 140: dev vlan2
limit 10p
qdisc pfifo 130: dev vlan2 limit 80p
qdisc pfifo 120: dev vlan2
limit 80p
qdisc pfifo 110: dev vlan2 limit 10p
qdisc htb 1: dev vlan2 r2q
10 default 13 direct_packets_stat 0
The output for tc -d -s
class show dev vlan2 is like the following for root rate is 50Mbit and ceil for
class is 50Mbit:
class htb 1:11 parent 1:1
leaf 110: prio 0 quantum 37500 rate 3000Kbit ceil 10000Kbit burst 50Kb/8 mpu 0b
overhead 0b cburst 14098b Sent 0 bytes 0 pkts (dropped 0, overlimits
0)
lended: 0 borrowed: 0 giants: 0
tokens: 111847 ctokens:
9240
class htb 1:1 root rate
50000Kbit ceil 50000Kbit burst 64093b/8 mpu 0b overhead 0b cburst 64093b/8 mpu
0b overhead 0b level 7 Sent 574199301 bytes 563132 pkts (dropped 0,
overlimits 0) rate 48914Kbit 5996pps
lended: 556777 borrowed: 0
giants: 0
tokens: -8491 ctokens: -8491
class htb 1:13 parent 1:1
leaf 130: prio 5 quantum 1000 rate 50000bit ceil 50000Kbit burst 10Kb/8 mpu 0b
overhead 0b cburst 64093b/ Sent 194194097 bytes 190578 pkts (dropped
671278, overlimits 0) rate 16780Kbit 2058pps backlog 81p
lended:
571 borrowed: 189926 giants: 0
tokens: -1018474 ctokens:
2725
class htb 1:12 parent 1:1
leaf 120: prio 1 quantum 6250 rate 500000bit ceil 50000Kbit burst 100Kb/8 mpu 0b
overhead 0b cburst 64093 Sent 380296800 bytes 372840 pkts (dropped 502882,
overlimits 0) rate 32212Kbit 3947pps backlog 81p
lended: 5784
borrowed: 366975 giants: 0
tokens: -753535 ctokens: -2291
class htb 1:14 parent 1:1
leaf 140: prio 7 quantum 1000 rate 12000bit ceil 50000Kbit burst 80Kb/8 mpu 0b
overhead 0b cburst 64093b/ Sent 0 bytes 0 pkts (dropped 0, overlimits
0)
lended: 0 borrowed: 0 giants: 0
tokens: 44739242 ctokens:
8401
The output for tc -d -s
class show dev vlan2 is like the following for root rate is 30Mbit and ceil for
class is 30Mbit:
class htb 1:11 parent 1:1
leaf 110: prio 0 quantum 37500 rate 3000Kbit ceil 10000Kbit burst 50Kb/8 mpu 0b
overhead 0b cburst 14098b Sent 0 bytes 0 pkts (dropped 0, overlimits
0)
lended: 0 borrowed: 0 giants: 0
tokens: 111847 ctokens:
9240
class htb 1:1 root rate
30000Kbit ceil 30000Kbit burst 39090b/8 mpu 0b overhead 0b cburst 39090b/8 mpu
0b overhead 0b level 7 Sent 499116401 bytes 489356 pkts (dropped 0,
overlimits 0) rate 28831Kbit 3533pps
lended: 480785 borrowed: 0
giants: 0
tokens: -8619 ctokens: -8619
class htb 1:13 parent 1:1
leaf 130: prio 5 quantum 1000 rate 50000bit ceil 30000Kbit burst 10Kb/8 mpu 0b
overhead 0b cburst 39090b/ Sent 47379739 bytes 46477 pkts (dropped
1342031, overlimits 0) rate 178992bit 22pps backlog 81p
lended:
846 borrowed: 45549 giants: 0
tokens: -513805 ctokens: 1247
class htb 1:12 parent 1:1
leaf 120: prio 1 quantum 6250 rate 500000bit ceil 30000Kbit burst 100Kb/8 mpu 0b
overhead 0b cburst 39090 Sent 451978320 bytes 443116 pkts (dropped 710651,
overlimits 0) rate 28672Kbit 3513pps backlog 81p
lended: 7725
borrowed: 435310 giants: 0
tokens: -344531 ctokens: -8589
class htb 1:14 parent 1:1
leaf 140: prio 7 quantum 1000 rate 12000bit ceil 30000Kbit burst 80Kb/8 mpu 0b
overhead 0b cburst 39090b/ Sent 0 bytes 0 pkts (dropped 0, overlimits
0)
lended: 0 borrowed: 0 giants: 0
tokens: 44739242 ctokens:
8540
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Yong Yao
Software Engineer
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Cisco CRDC Linksys
Floor 11-16,
Block C,
No.900, Yishan Road,
Caohejing Hi-Tech
Park
Shanghai, P.R.C.200233 |
| yoyao@cisco.com |
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