I'm seeing some weird behavior when I'm trying to add some htb queue
settings with large burst sizes. It seems that if I specify a burst
size over 3355443kb, the number rolls over. For example:
# tc class add dev vnet1 parent 1: classid 1:1 htb rate 12500kbps ceil
125000kbps burst 3355444kb
# tc class show dev vnet1 parent 1:
class htb 1:1 root prio 0 rate 100000Kbit ceil 1000Mbit burst 812b
cburst 1375b
Is there supposed to be a limitation here? I can't seem to find anything
in the documentation talking about it.
I've tested this with iproute2-3.12.0 on 3.13.1-1.el6.elrepo.x86_64.
This is the full set of commands I was using (these are what libvirt
applies by default):
tc qdisc del dev vnet1 root
tc qdisc del dev vnet1 ingress
tc qdisc add dev vnet1 root handle 1: htb default 1
tc class add dev vnet1 parent 1: classid 1:1 htb rate 12500kbps ceil
125000kbps burst 3355444kb
tc class show dev vnet1 parent 1:
Ultimately, I'm trying to allow bursts at 1000mbit up to 100GB or so,
then restrict things to a lower speed. I'm not aware of any way to do
this aside from using a large burst size.
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