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#openstack-nova - 2021-11-02
15:40:47 sean-k-mooney[m] we show the same regardless of if you use qemu with the tcg backend or kvm
15:41:19 EugenMayer i see
15:41:21 bauzas kashyap: lyarwood: need help with some bug to triage upstream https://bugs.launchpad.net/nova/+bug/1949224
15:41:39 EugenMayer i wondered, since the default of nova_compute_virt_type is kvm
15:42:05 EugenMayer sean-k-mooney[m] how to be sure KVM is used?
15:42:14 kashyap bauzas: Hmm, I have a vague recall of a similar issue from the past, but I need to reload some context. Will check tomm
15:42:31 bauzas kashyap: I just asked for qemu/libvirt versions
15:42:32 sean-k-mooney[m] on the compute host you can do a virsh list then a virsh dumpxml on the domian
15:42:42 sean-k-mooney[m] EugenMayer: ^
15:42:54 bauzas kashyap: I'm tempted to say this is unrelated to Nova but rather a libvirt/virt bug
15:42:57 kashyap bauzas: That's a good catch. We don't test this area all that much
15:43:03 kashyap Let's see if it's a bug yet :)
15:43:36 EugenMayer sean-k-mooney[m]: <domain type='kvm' id='1'>
15:44:02 sean-k-mooney[m] yep that should be using kvm then
15:44:08 EugenMayer so what could be the actual reason for this massive slowdown? this host easily hosted heavy load with proxmox
15:45:02 sean-k-mooney[m] what do you have the cpu model set to?
15:45:08 sean-k-mooney[m] and mode
15:45:28 sean-k-mooney[m] by default its unset which for the libvirt dirver will get treated as if you set host-model
15:45:36 EugenMayer sean-k-mooney[m] https://gist.github.com/EugenMayer/cacd5c44ae7dafffa31c9c8025bee3aa
15:46:15 sean-k-mooney[m] i know that there were slowdowns on older qemu versions with amd cpus because they did not have the correct cpu_models defiedn
15:46:49 sean-k-mooney[m] you should proably try setting [libvirt]/cpu_mode=host-passthrough
15:46:57 EugenMayer this is bullseye debian - same as for proxmox
15:47:26 EugenMayer i would assume that it would run the same way. Sureley pve uses a different kernel but still suprised
15:48:00 sean-k-mooney[m] if that improves the performance on the razen 5950x then it likely means you just need a newer qemu to get better perfromance out of the box without using host-passhtough
15:48:25 EugenMayer understood
15:48:42 EugenMayer trying to up the kernel from the backports and will check what qemu version would be on ubuntu
15:48:48 EugenMayer thank you for the hint!
15:48:59 EugenMayer how would i actually change the cpu_mode with nova?
15:49:26 sean-k-mooney[m] in the nova.conf set cpu_mode in the libvirt section
15:49:40 opendevreview Balazs Gibizer proposed openstack/nova stable/wallaby: Query ports with admin client to get resource_request https://review.opendev.org/c/openstack/nova/+/811416
15:50:17 EugenMayer sean-k-mooney[m] do i need to redo the instances or just stop/start?
15:50:59 bauzas last reminder: nova weekly meeting starts in 10 mins now here in this chan :)
15:51:14 EugenMayer bauzas i will shut up then, promised :)
15:51:31 bauzas (spoiler alert, you'll see new meetbot commands :p )
15:51:37 sean-k-mooney[m] just hard reboot after restarting the agent
15:51:41 sean-k-mooney[m] https://docs.openstack.org/nova/latest/configuration/config.html#libvirt.cpu_mode
15:52:14 EugenMayer sean-k-mooney[m] again, thanks!
15:52:21 bauzas (actually, not 'new', since I used them in 2014, but I haven't seen them used for a while now, so I'm all about using them back :D )
15:52:34 sean-k-mooney[m] EugenMayer: you likely dont need to update the kernel by the way but its worth a shot if that does not help
15:52:45 EugenMayer bauzas you jinxed it, so it might fail! :D
15:53:55 bauzas the more people joining us, the better it will be :)
15:54:05 opendevreview Balazs Gibizer proposed openstack/nova stable/wallaby: Reproduce bug 1945310 https://review.opendev.org/c/openstack/nova/+/811414
15:54:14 bauzas if I can make jokes to let people chime in, I can try
15:55:12 opendevreview Balazs Gibizer proposed openstack/nova stable/wallaby: Query ports with admin client to get resource_request https://review.opendev.org/c/openstack/nova/+/811416
15:55:20 opendevreview Balazs Gibizer proposed openstack/nova stable/wallaby: Query ports with admin client to get resource_request https://review.opendev.org/c/openstack/nova/+/811416
15:58:18 EugenMayer sean-k-mooney[m] massive speedup - 17 seconds
15:59:49 sean-k-mooney[m] cool so basically what happening qemu does not have a profile that matches your cpu. the simplet way to fix that is to update qemu to on that does. failing that host-passthough is a good choice if you dont need to live migrate the vms to different cpu models
16:00:04 sean-k-mooney[m] althernitvie you can pick one that is close and add flags
16:00:18 sean-k-mooney[m] we can tell you how to do that after the meeting but what you have should be fine for now
16:00:42 bauzas 3...
16:00:47 bauzas 2...
16:00:48 bauzas 1...
16:00:51 opendevmeet The meeting name has been set to 'nova'
16:00:51 opendevmeet Useful Commands: #action #agreed #help #info #idea #link #topic #startvote.
16:00:51 opendevmeet Meeting started Tue Nov 2 16:00:51 2021 UTC and is due to finish in 60 minutes. The chair is bauzas. Information about MeetBot at http://wiki.debian.org/MeetBot.
16:00:51 bauzas #startmeeting nova
16:01:07 bauzas #link https://wiki.openstack.org/wiki/Meetings/Nova#Agenda_for_next_meeting
16:01:16 bauzas good day, everyone
16:01:19 dansmith o/
16:01:27 sean-k-mooney[m] o/
16:01:59 gibi \o
16:02:02 bauzas as discussed before, I will exceptionnally be only able to chair this meeting for 30 mins
16:02:12 bauzas so I'll let gibi co-chair
16:02:15 opendevmeet Current chairs: bauzas gibi
16:02:15 bauzas #chair gibi
16:02:39 bauzas let's start while people join
16:02:46 bauzas #topic Bugs (stuck/critical)
16:02:50 bauzas No Critical bug
16:03:13 bauzas #link 20 new untriaged bugs (+0 since the last meeting): #link https://bugs.launchpad.net/nova/+bugs?search=Search&field.status=New
16:03:31 bauzas thanks to anybody who triaged a few of them
16:04:11 bauzas #help any help is appreciated with bug triage and we have a how-to https://wiki.openstack.org/wiki/Nova/BugTriage#Tags
16:04:35 bauzas 32 open stories (+0 since the last meeting) in Storyboard for Placement #link https://storyboard.openstack.org/#!/project/openstack/placement
16:05:20 bauzas so, maybe we closed one or more stories in Storyboard, but I don't think so
16:06:00 bauzas yeah, last story was written on Oct 21st
16:06:19 bauzas any bug to discuss in particular ?
16:07:00 bauzas ok, I guess no, moving on
16:07:05 bauzas #topic Gate status
16:07:11 bauzas Nova gate bugs #link https://bugs.launchpad.net/nova/+bugs?field.tag=gate-failure
16:07:25 bauzas nothing new
16:07:33 bauzas Placement periodic job status #link https://zuul.openstack.org/builds?project=openstack%2Fplacement&pipeline=periodic-weekly
16:07:45 bauzas no issues so far ^
16:08:01 bauzas just the usual reminder,
16:08:03 bauzas Please look at the gate failures, file a bug, and add an elastic-recheck signature in the opendev/elastic-recheck repo (example: #link https://review.opendev.org/#/c/759967)
16:08:13 bauzas that's it for gate status
16:08:15 gibi this is a gate fix that needs a second core https://review.opendev.org/c/openstack/nova/+/814036
16:08:20 bauzas oh right
16:08:44 bauzas gibi: I'll look at it while we speak
16:09:12 gibi thanks
16:09:26 bauzas (already looked at it, but need one last glance)
16:09:56 bauzas moving on or any gate failure to mention besides the above one ?
16:10:54 bauzas #topic Release Planning
16:10:58 bauzas Yoga-1 is due Nova 18th #link https://releases.openstack.org/yoga/schedule.html#y-1
16:11:10 bauzas (3 weeks from now)
16:11:20 bauzas err, 2 weeks
16:11:24 bauzas +2d
16:11:37 bauzas which means, typey typey your specs
16:12:25 bauzas https://review.opendev.org/q/project:openstack/nova-specs+is:open is not that large
16:12:48 bauzas what makes me tell :
16:12:56 bauzas #startvote Spec review day proposal on Tuesday Nova 16th ? (yes, no)
16:13:22 gibi yes

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