BATMAN_V throughput on bridge, vxlan and veth
For these interfaces, bridge, vxlan and veth, batman-adv currently uses the 1Mbit/s default throughput. Also see:
For vxlan Matthias is currently working on a patch to inherit the properties from its parent device (similar to what vlan does).
For veth ethtool reports 10Gbit/s, which is way more reasonable value for an in-kernel connection than our 1MBit/s default value:
$ ethtool veth0 Settings for veth0: Supported ports: [ ] Supported link modes: Not reported Supported pause frame use: No Supports auto-negotiation: No Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: off MDI-X: Unknown Link detected: yes
However batman-adv uses the default 1MBit/s throughput value due to auto-negotiation being disabled. We could add an exception in batman-adv for veth to disregard the auto-negotiation property, however that would not be sufficient for applications with for instance v(x)lans stacked on top of veth.
For bridge interfaces it is even more tricky.
Updated by Linus Lüssing 6 months ago
Approaches that could be worth discussing:
- Should veth be patched to advertise auto-negotiation=on?
- Should batman-adv be patched to disregard auto-negotiation property for veth?
- Should the bridge be patched to advertise the minimum speed of all bridge ports?
- Should there be a user, per hard-iface option in batman-adv to always fetch the speed regardless of the auto-negotiation flag?
- Should the auto-negotiation flag check in batman-adv be removed and instead applying the default throughput to a list of specific interface types, only? (e.g. tap, l2tp, ...)