Do we need to take into account any overhead being added by the protocol stack along the way?
For example, if the underlying MAAS machine can be told to use 9000 byte MTUs and jumbo frames, then each layer up could adopt that, but might need to chop off some of that for protocol / tunnel / encapsulation overhead. I've seen cases where your "internal" interface needs to have, say 20 byte smaller MTUs than the host. Perhaps THAT's the bit that we should focus on specifying. So MAAS gets told "just jumbo frames here" and then everything else focuses on understanding and allowing for overhead, but maximising MTU subject to that overhead. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1355813 Title: Interface MTU management across MAAS/juju Status in juju-core: Fix Released Status in MAAS: Triaged Status in juju-core package in Ubuntu: Triaged Status in lxc package in Ubuntu: Invalid Bug description: Context: juju + MAAS deployed OpenStack environment, misc services deployed under LXC on the bootstrap node, interfaces configured for jumbo frames - note that I had to manually set the LXC container interfaces to mtu 9000 before the bridge would do the same. Action: Reboot one of the containers; MTU on br0 resets from 9000 -> 1500. This feels like more of a 'we need a better way to orchestrate MTU configuration across different services' so raising tasks for MAAS and Juju as well. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lxc 1.0.5-0ubuntu0.1 ProcVersionSignature: User Name 3.13.0-24.47-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.3 Architecture: amd64 Date: Tue Aug 12 13:26:00 2014 KernLog: SourcePackage: lxc UpgradeStatus: No upgrade log present (probably fresh install) defaults.conf: lxc.network.type = veth lxc.network.link = lxcbr0 lxc.network.flags = up lxc.network.hwaddr = 00:16:3e:xx:xx:xx lxcsyslog: To manage notifications about this bug go to: https://bugs.launchpad.net/juju-core/+bug/1355813/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
