Hi
Recently i was testing shaping over single 10G cards, for speeds up to
3-4Gbps, and noticed interesting effect.
Shaping scheme:
Incoming bandwidth comes to switch port, with access vlan 100
Outgoing bandwidth leaves switch port with access vlan 200
Linux with Intel X710 connected to trunk port, bridge created, eth0.100
bridged to eth0.200
gso/gro/tso disabled (they doesn't work nice with shapers)
Sure latest kernel
Shaper are installed on eth0.200, and seems multiqueue works on eth0 in
general (i see packets are distributed over each queue), CPU load is
very low (max 20% on core, but usually below 5%).
I tried:
HTB with fq, pfifo, pie qdisc
HFSC with fq, pfifo, pie qdisc
After i run shaper with default values, i can see traffic start to queue
in classes and total traffic doesn't reach more than 2.4Gbit, and if i
remove shaper it directly reach 4Gbit.
The only trick i found, it is running pie with burst 10000 cburst 10000
in leaf classes, and 100000 in root class (i think 10000 in root class
might work as well). If i change discipline to fq, i am returning back
to 2.4Gbit, but it might be just because fq is not intended to be used
with HTB leaf class.
So in my case burst/cburst solved issue, but i suspect maybe possible
more elegant solution/tuning, than putting some random values?
Is there any particular reason why i am limited by ~2.4Gbit on any other
settings?
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