Comment 5 for bug 1566797

Verify on:
[root@nailgun ~]# shotgun2 short-report
cat /etc/fuel_build_id:
 195
cat /etc/fuel_build_number:
 195
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 mitaka-9.0
rpm -qa | egrep 'fuel|astute|network-checker|nailgun|packetary|shotgun':
 fuel-release-9.0.0-1.mos6332.noarch
 fuel-misc-9.0.0-1.mos8290.noarch
 python-packetary-9.0.0-1.mos131.noarch
 fuel-openstack-metadata-9.0.0-1.mos8648.noarch
 fuel-provisioning-scripts-9.0.0-1.mos8648.noarch
 python-fuelclient-9.0.0-1.mos306.noarch
 fuel-9.0.0-1.mos6332.noarch
 fuel-nailgun-9.0.0-1.mos8648.noarch
 rubygem-astute-9.0.0-1.mos738.noarch
 fuel-library9.0-9.0.0-1.mos8290.noarch
 fuel-agent-9.0.0-1.mos272.noarch
 fuel-ui-9.0.0-1.mos2658.noarch
 fuel-setup-9.0.0-1.mos6332.noarch
 nailgun-mcagents-9.0.0-1.mos738.noarch
 shotgun-9.0.0-1.mos87.noarch
 network-checker-9.0.0-1.mos72.x86_64
 fuel-bootstrap-cli-9.0.0-1.mos272.noarch
 fuel-migrate-9.0.0-1.mos8290.noarch
 fuelmenu-9.0.0-1.mos268.noarch
 fuel-notify-9.0.0-1.mos8290.noarch
 fuel-ostf-9.0.0-1.mos924.noarch
 fuel-mirror-9.0.0-1.mos131.noarch
 fuel-utils-9.0.0-1.mos8290.noarch

In neutron.conf max_pool_size is equil = 20
(processorcount = 4 in my case)