Cloning to openstack-foreman-installer for required buppet work +++ This bug was initially created as a clone of Bug #1151274 +++ Description of problem: The RHEL OSP Installer does not have a setting for desired MTU on tenant network interface on hosts. The MTU on the Compute hosts and Neutron Networker is important because it is a dependency for setting the network_device_mtu in nova and the veth_mtu in the openvswitch config on the compute hosts and the networker node. Performance in VMs is greatly increased by setting the MTU inside the VM to use jumbo frames, but that requires the entire path to have high MTUs (OVS veth, VM network device, and host physical interface). For that reason the MTU should be set in the /etc/sysconfig/ifcfg-X for the physical interfaces that are used for tenant networks. Version-Release number of selected component (if applicable): 1:1.5.0-0.6.RC2.el6ost How reproducible: Deploy OpenStack using the RHEL OSP Installer, there is no MTU set in the interface config. Steps to Reproduce: 1. Install RHEL OSP Installer 2. Deploy OpenStack 3. Check interfaces on compute hosts and network controller Actual results: No MTU is set, so the interface default is used Expected results: There should be a UI element to set the interface MTU, right next to the place where the interface is chosen for tenant networks (in the Deployment configuration) Additional info: There should really be a warning that the MTU on the switch ports must also be set at least as high as the chosen MTU, otherwise the custom MTU may cause connectivity problems. --- Additional comment from Dan Sneddon on 2014-10-09 22:57:48 EDT --- In testing, I found the following performance variance: Netperf TCP_SENDFILE 60-Second Transfer, average Cross-rack, VM MTU 1500: 1.45 Gb/s Cross-rack, VM MTU 8950: 7.39 Gb/s Same-rack, VM MTU 1500: 1.95 Gb/s Same-rack, VM MTU 8950: 8.3 Gb/s
PR available: https://github.com/redhat-openstack/astapor/pull/407
Merged
Verified: Environment: ruby193-rubygem-foreman_openstack_simplify-0.0.6-8.el7ost.noarch openstack-foreman-installer-3.0.8-1.el7ost.noarch ruby193-rubygem-staypuft-0.5.10-1.el7ost.noarch rhel-osp-installer-client-0.5.5-1.el7ost.noarch openstack-puppet-modules-2014.2.8-1.el7ost.noarch rhel-osp-installer-0.5.5-1.el7ost.noarch Configured the value in "Tenant Network Device MTU" field to 1612. The neutron/nova = <value>-50 On controller: grep 1562 /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini veth_mtu=1562 On compute: grep 1562 /etc/nova/nova.conf network_device_mtu=1562 The MTU on the tenant NIC is "MTU=1612"
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-0156.html