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| zioproto | hello | 13:31 |
|---|---|---|
| zioproto | I upgraded to Mitaka yesterday | 13:31 |
| zioproto | now my new networks | 13:31 |
| zioproto | are created with a MTU 1450 | 13:31 |
| zioproto | is this a new feature ? | 13:31 |
| zioproto | I cant find anything about this change in the release notes | 13:31 |
| zioproto | anyone spotted this thing in the upgrade liberty to mitaka ? | 13:31 |
| rmart04 | have a look in /etc/neutron/plugins/ at the dhcp config, thatts where it push’es out the MTU for the neutron networks | 13:34 |
| rmart04 | might be a new default, I’d check the config ref | 13:34 |
| zioproto | I have the default for global_physnet_mtu to 1500, and openstack tries to be smart and lowers to 1450 my subnet interfaces | 13:39 |
| zioproto | I have to set global_physnet_mtu to 9000 | 13:39 |
| zioproto | working on my puppet code to do that asap | 13:39 |
| zioproto | it would be nice to have this new config changes in the Release notes | 13:39 |
| zioproto | if you grep for MTU there is nothing in the MItaka release notes :( | 13:39 |
| rmart04 | ah OK cool! | 13:41 |
| rmart04 | Yea I guess its leaving headroom for any encapsulation headers | 13:41 |
| matt_jarvis | are you using vxlan ? | 13:42 |
| matt_jarvis | I think Mitaka automatically calculates it now based on the network config, and what you've set for the default | 13:44 |
| rmart04 | I didnt know that had changed in Mitaka, but I haven’t had a lot of face time with it | 13:52 |
| zioproto | yes I am using vxlan | 13:55 |
| zioproto | but I have mtu 9000 on physnet | 13:55 |
| zioproto | so before openstack was putting 1500 that was ok for me | 13:55 |
| zioproto | now I have to tune to 1550 because openstack removes 50 bytes | 13:56 |
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| mnaser | any tata customers? | 15:18 |
| mnaser | we're having a ton of connectivity issues today for traffic flowing through them | 15:18 |
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| clayton | zioproto: I had to set neutron::global_physnet_mtu and neutron::plugins::ml2::path_mtu to the physical mtu | 15:39 |
| clayton | that still won't advertise the bigger mtu via dhcp by default w/the puppet modules | 15:40 |
| clayton | the latter effects the mtu for router interfaces | 15:40 |
| zioproto | I did set only neutron::global_physnet_mtu so far, what is the other option for ? | 15:40 |
| clayton | the other thing is, the OVS switch is going to set the mtu on all interfaces to whatever the lowest is on any port | 15:40 |
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| clayton | so your existing switches may be effectively "poisoned" by the previous setting | 15:41 |
| zioproto | wow | 15:43 |
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| zioproto | so at the moment I have path_mtu = 0 | 15:45 |
| zioproto | no idea how I ended up with this value :) | 15:46 |
| zioproto | puppet is magic :) | 15:46 |
| zioproto | ok | 15:50 |
| zioproto | it comes from here: https://github.com/openstack/puppet-neutron/blob/master/manifests/plugins/ml2.pp#L151 | 15:50 |
| zioproto | it makes absolutely no sense to 0 | 15:50 |
| zioproto | do you guys think is a puppet bug ? | 15:50 |
| zioproto | I have no idea what happens in the code with this set to 0 | 15:51 |
| zioproto | clayton: you are using puppet as well right ? | 15:51 |
| clayton | yes | 15:51 |
| zioproto | do you have any clue about this 0 value ? | 15:51 |
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| clayton | yeah, it was a month or two ago when I went through this, but 0 didn't do what we wanted | 15:52 |
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| zioproto | and what did it do ? | 15:53 |
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| zioproto | it looks like it is an important setting only if you want to advertise the mtu | 16:01 |
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| zioproto | I am going through the code | 16:01 |
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| clayton | zioproto: the advertise mtu via dhcp is a separate setting, we're not setting that | 16:18 |
| clayton | we want the mtu to be higher than 1500 (around 8k in our case), but we don't want customers to get it by default | 16:18 |
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| zioproto | that's all for today folks, see you tomorrow | 16:20 |
| zioproto | thanks ! | 16:20 |
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| cburgess | mriedem: Catching up from before the holidays, what was that about RBD things? | 17:14 |
| mriedem | cburgess: no idea | 17:14 |
| mriedem | oh, | 17:14 |
| mriedem | someone had some issue, but now i don't remember what it was | 17:14 |
| cburgess | mriedem Got it I shall go back to my cave then until summoned again. | 17:15 |
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| mnaser | grumpy openstack anyone? ha. https://github.com/google/grumpy | 23:30 |
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| dmsimard | mnaser: well it's made by google so it has to be good right | 23:36 |
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