TC HTB r2q
2015-12-09 18:05
399 查看
HTB:
quantum of class 10001 is big. Consider r2q change.
根据HTB的官方文档显示,quantum是在可以“借”的情况下,一次可以“借”多少,并且说这个值最好尽量的小,但要大于MTU;而且这个值是不用手动设置,它会根据r2q的值计算出来。
Changing burst will not remove the warning. r2q is "rate to quantum" is used
to calculate the quantum for each class : quantum = rate / r2q. Quantum must
be 1500 < quantum < 60000. Otherwise you will get warnings from the kernel.
Solution : choose r2q so for each class 1500 < quantum < 60000
Or choose the best r2q you can and specify the quantum manually if you add a
class.
> tc qdisc add dev eth0 root handle 1: htb default 10
Default r2q = 10.
> tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit burst 2k
> tc class add dev eth0 parent 1:1 classid 1:10 htb rate 80mbit ceil 100mbit
> burst 2k
>
> tc class add dev eth0 parent 1:1 classid 1:11 htb rate 128kbit burst 2k
> tc class add dev eth0 parent 1:11 classid 1:21 htb rate 16kbit ceil 56kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:22 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:23 htb rate 16kbit ceil 72kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:24 htb rate 16kbit ceil 64kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:25 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:26 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:27 htb rate 16kbit ceil 32kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:28 htb rate 16kbit ceil 56kbit
> burst 2k
Smallest rate : 16kbit = 2 kilobyt / r2q (=10) = 200. And this is < 1500. So
you get warnings.
Biggest rate : 100mbit = 12.5 mbyte / r2q = 1.2 Mbyte > 60.000. So you get
warnings.
If you do
tc qdisc add dev eth0 root handle 1: htb default 10 r2q 1
Smallest rate : 16kbit = 2kilobyte / r2k = 2000. And this is > 1500. So no
warnings.
Biggest rate : 100mbit = 12.5 mbyte / r2q = 12.5 Mbyte > 60.000. So you get
warnings. But you can overrule the quantum :
tc class add dev eth0 parent 1:1 classid 1:11 htb rate 128kbit burst 2k
quantum 60000
Quantum is used when 2 classes are getting more bandwidth then the rate. So
it's only important for sharing the remaining bandwidth. In that case, each
class may send quantum bytes.
quantum of class 10001 is big. Consider r2q change.
根据HTB的官方文档显示,quantum是在可以“借”的情况下,一次可以“借”多少,并且说这个值最好尽量的小,但要大于MTU;而且这个值是不用手动设置,它会根据r2q的值计算出来。
Changing burst will not remove the warning. r2q is "rate to quantum" is used
to calculate the quantum for each class : quantum = rate / r2q. Quantum must
be 1500 < quantum < 60000. Otherwise you will get warnings from the kernel.
Solution : choose r2q so for each class 1500 < quantum < 60000
Or choose the best r2q you can and specify the quantum manually if you add a
class.
> tc qdisc add dev eth0 root handle 1: htb default 10
Default r2q = 10.
> tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit burst 2k
> tc class add dev eth0 parent 1:1 classid 1:10 htb rate 80mbit ceil 100mbit
> burst 2k
>
> tc class add dev eth0 parent 1:1 classid 1:11 htb rate 128kbit burst 2k
> tc class add dev eth0 parent 1:11 classid 1:21 htb rate 16kbit ceil 56kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:22 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:23 htb rate 16kbit ceil 72kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:24 htb rate 16kbit ceil 64kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:25 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:26 htb rate 16kbit ceil 40kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:27 htb rate 16kbit ceil 32kbit
> burst 2k
> tc class add dev eth0 parent 1:11 classid 1:28 htb rate 16kbit ceil 56kbit
> burst 2k
Smallest rate : 16kbit = 2 kilobyt / r2q (=10) = 200. And this is < 1500. So
you get warnings.
Biggest rate : 100mbit = 12.5 mbyte / r2q = 1.2 Mbyte > 60.000. So you get
warnings.
If you do
tc qdisc add dev eth0 root handle 1: htb default 10 r2q 1
Smallest rate : 16kbit = 2kilobyte / r2k = 2000. And this is > 1500. So no
warnings.
Biggest rate : 100mbit = 12.5 mbyte / r2q = 12.5 Mbyte > 60.000. So you get
warnings. But you can overrule the quantum :
tc class add dev eth0 parent 1:1 classid 1:11 htb rate 128kbit burst 2k
quantum 60000
Quantum is used when 2 classes are getting more bandwidth then the rate. So
it's only important for sharing the remaining bandwidth. In that case, each
class may send quantum bytes.
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