Tuesday, 2019-05-21

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kata-irc-bot2<bergwolf> FYI/Reminder, @xu has sent out a notice on kata-dev mailing list that there is no AC meeting this week08:34
kata-irc-bot2<graham.whaley> yep, thanks @bergwolf - I will circulate that reminder internally here :slightly_smiling_face:08:48
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davidgilukgmmaha: So did you get virtio-fs + hugepage + virtio-net working?16:11
gmmahadavidgiluk: ohh yes, we did. it was an issue with NEMU and vhost-net that was breaking things.16:12
davidgilukgmmaha: Ah great; out of interest what was the problem?16:12
gmmahathe symptom is when hugepages is enabled with vhost-net and machine_type=virt, the container is not able to have a network connection. It has an IP but is unable to reach the gateway.16:13
gmmahathe issue itself is being debugged now. hopefully we will know soon on why that was happening.16:13
davidgilukok16:14
davidgilukgmmaha: I saw the mention of VM snapshotting - is that the thing where you use a fixed copy of memory?16:14
gmmahadavidgiluk: templating? yeah. one where we use the same kernel, initramfs and agent memory.16:16
davidgilukgmmaha: If I remember correctly that's done as a fudged type of migrate (that doesn't bother with ram) - now we've not taught virtiofs how to do migrate yet16:17
davidgilukgmmaha: Although if you hotplug the virtiofs after the template then you have a good chance I think16:17
gmmahaaah.. makes sense why virtio-fs will not work with it.16:18
gmmahawonder how hotplug of the rootfs will work there.16:19
davidgilukah actually - even the hotplug probably wont work16:19
davidgilukgmmaha: If I remember, the templating doesn't with shared=on - because otherwise the template would get overwritten - but we need shared=on for vhost-user16:20
kata-irc-bot2Action: graham.whaley notes both vmcache and templating have their individual own docs over at https://github.com/kata-containers/documentation/tree/master/how-to16:20
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gmmahadavidgiluk: they turn on sharing only under one condition. https://github.com/kata-containers/runtime/blob/9ef20dd837419058941a92152355f1c1456d5444/virtcontainers/qemu.go#L41416:21
gmmaha@graham.whaley yeah was going to say that.16:21
davidgilukgmmaha: Right; their idea is that when they create a new template they turn shared=on so that the content gets written back to the template file16:22
davidgilukgmmaha: The problem is that when they run a second time they don't want to change the template file so can't run with shared=on16:22
gmmaharight.. so that won't work with virtio-fs given we always need it shared. :(16:22
davidgilukgmmaha: It needs another way to keep the template file distinct from the running shared memory16:23
gmmaharight. i should have said, won't work in the current setup.16:23
davidgilukgmmaha: I once tried something unspeakable with lvm: https://lists.gnu.org/archive/html/qemu-devel/2018-04/msg03055.html16:26
* gmmaha stares speechless. 16:29
davidgiluksorry, I should have asked if you had just eaten before suggesting that16:29
gmmahahehhe16:29
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