| Posted | Nick | Remark | |
|---|---|---|---|
| #openstack-nova - 2025-11-13 | |||
| 16:28:08 | sean-k-mooney | are you using ml2/ovs? | |
| 16:28:35 | vsaienko | its ovs, no qos no security groups, in TC I see that traffic is offloaded | |
| 16:29:25 | sean-k-mooney | well in https://jumpshare.com/s/xHU2UTQoKoeKwAWDFsa6 | |
| 16:29:50 | sean-k-mooney | you are not hitting line rate env in the swtichdev case which is effectivly jsut using sriov for the dataplane | |
| 16:29:59 | sean-k-mooney | with ovs providing the contol plane | |
| 16:30:10 | vsaienko | yes | |
| 16:30:29 | sean-k-mooney | that to me suggest you are hittign bottel necks in teh trafic generateion as well | |
| 16:31:13 | vsaienko | not sure between hosts on same hypervisor iperf can show more, its new version with multithreads | |
| 16:31:35 | sean-k-mooney | well ierf it not really godo for doing real testing | |
| 16:31:43 | sean-k-mooney | you can use -p to have it use multipel cores | |
| 16:32:02 | sean-k-mooney | but if you want ot test this properly you eigher need a hardware traffic generator or somethign like trex | |
| 16:32:17 | vsaienko | yes, there are scenarios with p1 - its -P 1, p30 - -P 30 | |
| 16:32:23 | sean-k-mooney | https://trex-tgn.cisco.com/ | |
| 16:33:13 | sean-k-mooney | right but for 1400 by packets you shoudl be able to hit 10G even with 1 thread | |
| 16:34:03 | sean-k-mooney | if the hsot are other wise idel with 1400 by packets even standar kernel ovs shoudl be able to hit 10G | |
| 16:34:26 | sean-k-mooney | so to me the performac eof this host/vms is very much below what i woudl expect | |
| 16:36:00 | sean-k-mooney | vsaienko: what version of opesntack are you using | |
| 16:36:20 | vsaienko | but why with sriov it provides 6+gbps | |
| 16:36:27 | vsaienko | its epoxy | |
| 16:36:42 | sean-k-mooney | so 6GBPS is also too low for sriov | |
| 16:36:42 | vsaienko | 3.x openvswitch | |
| 16:37:01 | vsaienko | maybe indeed its a limitation of iperf | |
| 16:37:26 | sean-k-mooney | so if your using epoxy you shoudl have https://github.com/openstack/os-vif/blob/master/vif_plug_ovs/ovs.py#L107-L126 | |
| 16:37:45 | sean-k-mooney | but can you check in ovs what the qos policy on the ovs port is set too | |
| 16:37:53 | sean-k-mooney | and confirm its linux-noop | |
| 16:37:57 | vsaienko | qos plugin is disabled on my env | |
| 16:38:06 | sean-k-mooney | that is not what im asking | |
| 16:38:27 | vsaienko | but thanks for pointing this out, I haven't seen this option | |
| 16:38:30 | sean-k-mooney | in new version fo systemd or the kernel the default qdisg was changed to fq_codel | |
| 16:38:55 | sean-k-mooney | now we added this option to make sure tha tthat was disabled on teh tap devices | |
| 16:39:08 | vsaienko | interesting | |
| 16:39:11 | vsaienko | let me check this | |
| 16:39:11 | sean-k-mooney | because if we dont ti results in massive perfroamce hti | |
| 16:39:21 | vsaienko | it should be default | |
| 16:39:24 | sean-k-mooney | yep | |
| 16:39:47 | sean-k-mooney | so we need ot check that 1 the policy in ovs set by os-vif is linux-noop | |
| 16:40:23 | sean-k-mooney | but we shoudl also check that the representor netdev added to ovs does not have a qos policy applied with tc | |
| 16:40:53 | vsaienko | its not explicitly set, so default is picked | |
| 16:41:39 | sean-k-mooney | right so im askign you to conrimf this because this was never tested for vdpa or hardware offloaded ovs | |
| 16:41:46 | sean-k-mooney | it shoudl get appled but it may not be | |
| 16:42:01 | sean-k-mooney | and if its not beign set in the ovs db then it coudl reduce the performacne | |
| 16:43:43 | vsaienko | https://paste.openstack.org/show/bZeQE1UxDhnNWIpJmiCb/ | |
| 16:44:31 | sean-k-mooney | yep that the problem | |
| 16:44:35 | sean-k-mooney | its using fqcodel | |
| 16:44:57 | sean-k-mooney | create /etc/sysctl.conf.d/99_qdisk.conf and add net.core.default_qdisc = pfifo | |
| 16:45:24 | sean-k-mooney | thatthen apply it and try doing it again with a new vm | |
| 16:45:39 | vsaienko | ok thanks, let me try | |
| 16:46:33 | sean-k-mooney | well that might work but lets confirm something | |
| 16:46:40 | sean-k-mooney | what is eth1 in this case | |
| 16:46:49 | sean-k-mooney | is it teh respreentor netdev for the vdpa device | |
| 16:47:10 | sean-k-mooney | i expect it si based on the altname | |
| 16:47:17 | sean-k-mooney | enp33s0f1npf1vf1 | |
| 16:47:48 | sean-k-mooney | if that is the case and the perfoamce impves when you set your defautl qdisc ot pfifo | |
| 16:48:18 | sean-k-mooney | the the issue you are hittig is the os-vif change is not properly handelign this edge case | |
| 16:49:09 | sean-k-mooney | it was intened to fix https://bugs.launchpad.net/os-vif/zed/+bug/2017868 for standard kernel ovs | |
| 16:54:19 | sean-k-mooney | vsaienko: if your using iperf to test you shousl also ensure that you have disable fqcodel i nteh guest. https://trex-tgn.cisco.com/ is a lot more work to set up but it woudl elimiante any worry that the traffic genreator is the bottel neck. maybe book mark that for future reading | |
| 16:57:58 | vsaienko | ack let me try this | |
| 16:58:00 | vsaienko | thanks | |
| 17:29:15 | vsaienko | sean-k-mooney: pfifo improves situation https://jumpshare.com/s/GkgTEynhPdHlvWptjih5 | |
| 17:31:28 | gmaan | gibi: RE default value change of config options (966016): yes it is fine as long as we are adding it in upgrade release notes. oslo.config have way to respect both old and new when config name is changed but for default value change, yes upgrade notes is right things. | |
| 17:33:15 | sean-k-mooney | vsaienko: ack it will likely improve the other results too if you ened up testing them | |
| 17:33:47 | sean-k-mooney | we know it can limit perforamce to <10% form some reports | |
| 17:34:01 | sean-k-mooney | diffent backend are affected more or less | |
| 17:34:26 | sean-k-mooney | os-vif obviouly has a blind spot for hardware offloaded ports that we shoudl fix | |
| 17:34:47 | sean-k-mooney | but the root of the issue was the changeing fo behviro in ovs and systemd | |
| 17:35:20 | sean-k-mooney | the defuatl qdisk was change about 3-4 year ago it used to be pfifo by default | |
| 17:35:41 | sean-k-mooney | ovs also change to not ignoring/removing the qdisc on port added to it by defualt | |
| 17:36:19 | gibi | gmaan: thanks! I added the upgrade reno | |
| 17:37:50 | sean-k-mooney | vsaienko: https://wiki.archlinux.org/title/Advanced_traffic_control#CoDel_and_Fair_Queueing_CoDel | |
| 17:38:09 | sean-k-mooney | that is some of the history on this changes it hapspen din systemd 217 | |
| 17:41:45 | opendevreview | Nicolai Ruckel proposed openstack/nova master: Preserve UEFI NVRAM variable store https://review.opendev.org/c/openstack/nova/+/959682 | |
| 17:44:45 | gmaan | anyone face/know the issue of not seeing 'comoute.<hostname>' queue in devstack env ? I am listing all queues (sudo rabiitmqctl list_queues) and it show all queues except compute service queues (oslo.message create three queues per compute service 1. 'compute' 2. 'compute.<hostname>' 3. compute fanout with uuids) | |
| 17:45:32 | gmaan | it list all other queues for example sch, conductor, cinder queues | |
| 17:47:07 | opendevreview | Nicolai Ruckel proposed openstack/nova master: Preserve UEFI NVRAM variable store https://review.opendev.org/c/openstack/nova/+/959682 | |
| 17:48:10 | nicolairuckel | sean-k-mooney, I found a few more places with code that wasn't necessary anymore | |
| 17:48:29 | nicolairuckel | I think it should be a lot cleaner now | |
| 17:48:37 | sean-k-mooney | yep im +1 on your patch after skimming it | |
| 17:48:51 | sean-k-mooney | ill upgrade to +2 after i have time to test it and read over it again | |
| 17:48:59 | nicolairuckel | perfect :) | |
| 17:50:51 | sean-k-mooney | gmaan: so it shoudl be "compute.{CONF.host}" but if the queue is not there it normally is a netwrokign or auth issue, i belive it can also happen if we exit because fo say the missing compute node id file | |
| 17:51:05 | sean-k-mooney | i.e. if the agent stop runing and the queue gets deleted | |
| 17:51:26 | gmaan | compute service is up, instance are booting fine so no issue on that side | |
| 17:51:53 | sean-k-mooney | are you lookig at the correct exchange? | |
| 17:52:06 | gmaan | if you have devstack running up, can you try if you see the comoute queues? | |
| 17:52:20 | gmaan | yes, nove and even i checked all exhange | |
| 17:52:34 | sean-k-mooney | sure i have one | |
| 17:52:49 | gmaan | before i boot new VM and install devstack i just want to cofirm if something in my machine | |
| 17:52:51 | gmaan | thanks | |
| 17:53:21 | sean-k-mooney | i have one on a host internally i can add you ssh key to it and you can ssh in and take a look if you want | |
| 17:54:16 | gmaan | its fine, if you can just check if any queue name with 'compute*'or paste the outphut of sudo rabiitmqctl list_queues | |
| 17:55:50 | sean-k-mooney | https://termbin.com/rzms | |
| 17:56:35 | sean-k-mooney | im not seeing any | |
| 17:56:36 | gmaan | yeah, same issue, no compute queue there | |
| 17:57:27 | sean-k-mooney | ah | |
| 17:57:37 | sean-k-mooney | so we use vhosts in devstack | |
| 17:57:42 | gmaan | instance booting successfully make sure no issue in queue creation but somehow it is not listed in rabbitmq command | |
| 17:57:43 | sean-k-mooney | and the compute are in nova_cell1 | |
| 17:58:08 | gmaan | yeah vhosts we use | |
| 17:58:22 | sean-k-mooney | https://termbin.com/01tb | |
| 17:58:37 | sean-k-mooney | that the output form "rabbitmqctl list_queues --vhost nova_cell1 | nc termbin.com 9999" | |