Description of problem:
The template creates 400 port(vnf core requirement) and it seems neutron requires more time to create the port.
seems there is a deadlock error in neutron log about connection to MariaDB:
2021-07-15 11:39:26.923 45 ERROR neutron_lib.callbacks.manager       DBDeadlock: (pymysql.err.InternalError) (1213, u'Deadlock found when trying to get lock; try restarting transaction') [SQL: u'UPDATE agents SET `load`=%(load)s WHERE agents.id = %(agents_id)s'] [parameters: {'load': 4, 'agents_id': u'138c03ba-87d6-4773-b506-e197d6aaf50a'}] (Background on this error at: http://sqlalche.me/e/2j85)
      DBDeadlock: (pymysql.err.InternalError) (1213, u'Deadlock found when trying to get lock; try r

Version-Release number of selected component (if applicable):
Openstack 13z8

How reproducible:
Network stack create

Steps to Reproduce:
1.Openstack Stack Create using a network yaml file



Actual results:
waiting 20/30 min to finish just network create(238)

Expected results:
Finish in 2/3 minutes

Additional info:
Disk SSD only for the director
The behavior is visible in all the cluster osp13z8 installed in the last year with the new Hardware (HP Gen 10)and not in the old cluster with Old HW (HP GEN 9) with the same release software.