Hi all, I’ve recently upgraded Openstack from Mitaka to Ocata and now I’m facing an increased latency in instance creation. Before the upgrade I was able to launch sequentially 400 VMs in 5 minutes and now I need at least 15 minutes. Attached the script I use to measure timings. Here you can find the comparison between Mitaka and Ocata. I also noticed that in Ocata DHCP agent is slower and sometimes when I launch more than 30 VMs sequentially some of them doesn’t took an address. Time of instance creation increase with the number of ports in the network. https://docs.google.com/spreadsheets/d/1eHjRxkw_5BmJ2p0rBJg9suGKmu_1YrSY05f5... <https://docs.google.com/spreadsheets/d/1eHjRxkw_5BmJ2p0rBJg9suGKmu_1YrSY05f50gKJxbE/edit?usp=sharing> I’ve enabled the osprofiler inside nova and neutron api and attached you can see that the most of the time is spent on wsgi component of neutron. The time is spent on getting port list. I’ve also verified with cli listing only ports and I can confirm is a port list related issue. I’m trying to profile the neutron-server with cProfile but I’ve some problems with multi-threading tracing. Does anyone have faced this issue? Thank you! Regards Matteo -------------------------------------------- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.