ChanServ changed the topic of #openvswitch to: Open vSwitch, a Linux Foundation Collaborative Project || FAQ: http://docs.openvswitch.org/en/latest/faq/ || OVN meeting Thurs 9:15 am US Pacific || Use ovs-discuss@openvswitch.org for questions if you don't get an answer here. || Channel logs can be found at https://libera.irclog.whitequark.org/openvswitch
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<mmichelson> Hi everyone it's time to begin the weekly OVN developers' meeting.
<dceara> Hi
<mkalcok> o/
<zhouhan> hi
<mmichelson> I'll start things off.
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<mmichelson> Tomorrow is the scheduled release of OVN 25.09.0. imaximets_ found a regression due to the copying of NB Logical Datapath UUIDs to SB Datapath_Bindings. dceara and I created a patch to fix this and it was merged earlier today.
<mmichelson> I've also been doing reviews and working on RH customer issues.
<fnordahl> o/
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<mmichelson> My question to everyone here is: do you know of any issues that should prevent the release of 25.09.0 tomorrow? If so, please speak up and let us know.
<mmichelson> And that's all I have for my update.
<imaximets> Xavier mentioned some upgrade issues with health checks today.
<imaximets> Not sure if that's worth postponing the release, I'm not very familiar with the details.
<dceara> Well, he also posted a patch to fix it, we should probably just review and hopefully merge the fix I guess.
<mmichelson> imaximets, ack. He's not on here, so I can't enquire here about how hard/easy it is to fix.
<mmichelson> OK, I'll prioritize reviewing that after this meeting is over.
<dceara> Speaking of issues that might block the release. I also have an issue that popped up just before this meeting. I'm not sure whether it should block the release though, maybe we can deal with it as a bug fix.
<dceara> In a slack conversation in the CNCF slack instance, ovn-kubernetes channel, ovn-k developers reported that https://github.com/ovn-org/ovn/commit/27cc274 will probably break ovn-kubernetes.
<dceara> More specifically some features like "external gateway" where they use source ip routing with ecmp-symmetric-reply.
<mmichelson> Didn't we specifically reach out to them about that patch?
<dceara> zhouhan, you're also tagged on that thread it would be great if you could also share your thoughts on it.
<dceara> Yes, we had cc-ed maintainers from all known CMS that use OVN. Since the first time the patch was posted, approx November 2024.
<dceara> And explicitly asked for feedback.
<zhouhan> dceara I am having an internal discussing with Tim
<dceara> zhouhan, ack, thank you
<dceara> mmichelson, I can also share a regular weekly update if I may.
<mmichelson> dceara, sure, go ahead.
<dceara> While working on the aforementioned upgrade issue that mmichelson fixed, I found some other small issues and posted patches for them. Some are already merged (by Ales). And today I posted a fix for an OVN BGP issue I had on my todo list for a while.
<dceara> Aside from that, looking forward to the release happening tomorrow! :)
<dceara> Oh, and I think we got feedback from most maintainers on mmichelson's release policy suggested changes. Linking it here for more visibility: https://patchwork.ozlabs.org/project/ovn/list/?series=471430
<mmichelson> dceara, yes, thanks! I had meant to bring that up in my update.
<dceara> That's it from me, thank you!
<mmichelson> But I forgot
<dceara> mmichelson, it's OK :)
<mmichelson> dceara, thanks for the update. Who would like to go next?
<zhouhan> May I have a quick report?
<zhouhan> For the tunnel scaling issue, I profiled the OVS bottleneck, and provided a patch for a low hanging fruit, got 50% latency reduction: https://patchwork.ozlabs.org/project/openvswitch/patch/20250902072953.240425-1-hzhou@ovn.org/
<zhouhan> imaximets if you could take a look.
<imaximets> zhouhan, sure. Thanks!
<zhouhan> However, it still doesn't solve the problem of the rest 50%. For the rest of the bottlenecks, we could improve the locking machanism but I think eventually incremental processing is required, which is non-trivial.
<zhouhan> So, I am continue exploring the flow-based tunneling. Basic function works, but still fight with tens of test case failures ...
<zhouhan> In addition, there is a proposal from ovn-k community for MCP server for LLM troubleshooting ...
<zhouhan> It is interesting, and asking for MCP server for OVN/OVS. I left some comments there. Welcome to more opinions
<zhouhan> That's it from me
<mmichelson> thanks zhouhan
<mmichelson> A lot to take in this week :)
<mmichelson> Who would like to go next?
<imaximets> May I?
<mmichelson> imaximets, you may
<imaximets> Not much from my side, been involved in discovering and discussing some of the upgrade issues mentioned above.
<imaximets> And submit your talks for the OVS+OVN Conference!
<imaximets> The original deadline was this Monday the 8th, but we got a few requests to extend it, so now it's on 22nd.
<imaximets> But sooner - the better. :)
<imaximets> That's all from me.
<dceara> imaximets, thanks for the reminder, I'm planning to send a proposal too!
<mmichelson> imaximets, OK thanks.
<moloings> Onliner, I have been working on port replication for transit router support
<mmichelson> moloings, thanks!
<mmichelson> Do we have anyone else that wants to give an update?
<mkalcok> I can go very quickly
<mkalcok> I got feedback from amusil regarding the fix for unnecessary CT commits of DNA_AND_SNAT traffic. I'll work it into a proposal the first chance I get
<mkalcok> (that's all)
<mmichelson> mkalcok, OK thanks!
<mmichelson> anyone else?
<fnordahl> oneliner: supporting erlon on their udp fragmentation patch series, otherwise downstream stuff for me, great with CFP extension, I'll spread the word
<mmichelson> fnordahl, cool, thanks!
<mmichelson> I didn't see any other OVN devs in here, but if there's anyone else I missed that wants to give an update, now's the time.
<mmichelson> I think that's it! Thanks everyone. Have a great day. And happy release day tomorrow!
<imaximets> Thanks! Bye.
<dceara> Thanks, bye!
<mmichelson> Bye!
<moloings> Bye!
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<fnordahl> \o thanks, cheers!
<mkalcok> thanks o/ bye
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