diff options
Diffstat (limited to 'docs/release/scenarios/os-nosdn-ovs_dpdk-ha/os-nosdn-ovs_dpdk-ha.rst')
| -rw-r--r-- | docs/release/scenarios/os-nosdn-ovs_dpdk-ha/os-nosdn-ovs_dpdk-ha.rst | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/docs/release/scenarios/os-nosdn-ovs_dpdk-ha/os-nosdn-ovs_dpdk-ha.rst b/docs/release/scenarios/os-nosdn-ovs_dpdk-ha/os-nosdn-ovs_dpdk-ha.rst new file mode 100644 index 00000000..cc5fee3b --- /dev/null +++ b/docs/release/scenarios/os-nosdn-ovs_dpdk-ha/os-nosdn-ovs_dpdk-ha.rst @@ -0,0 +1,91 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) <optionally add copywriters name> + +This document provides scenario level details for Euphrates 1.0 of +deployment with no SDN controller and DPDK enabled Open vSwitch. + +.. contents:: + :depth: 3 + :local: + +Introduction +============ + +NFV and virtualized high performance applications, such as video processing, +require Open vSwitch to be accelerated with a fast data plane solution that +provides both carrier grade forwarding performance, scalability and open +extensibility. + +A key component of any NFV solution is the virtual forwarder, which should +consist of soft switch that includes an accelerated data plane component. For +this, any virtual switch should make use of hardware accelerators and optimized +cache operation to be run in user space. + +Scenario components and composition +=================================== + +This scenario enables high performance data plan acceleration by utilizing +DPDK enabled Open vSwitch (OVS). This allows packet switching to be isolated +to particular hardware resources (CPUs, huge page memory allocation) without +kernel interrupt or context switching on the data plane CPU. + +Tenant networking leverages Open vSwitch accelerated with a fast user space +data path such. OVS with the Linux kernel module data path is used for all +other connectivity, such as connectivity to the external network (i.e. br-ex) +is performed via non-accelerated OVS. + +Scenario Configuration +====================== + +Due to the performance optimization done by this scenario, it is recommended to +set some performance settings in the deploy settings in order to ensure maximum +performance. This is not necessary unless doing a baremetal deployment. Note, +this scenario requires taking the NIC mapped to the tenant network on the +compute node and binding it to DPDK. This means it will no longer be +accessible via the kernel. Ensure the NIC that is mapped to the Compute +Tenant network supports DPDK. + +Make a copy of the deploy settings file, os-nosdn-ovs_dpdk-ha.yaml. Under the +kernel options for Compute, edit as follows: + - hugepagesz: the size of hugepages as an integer, followed by unit M + (megabyte) or G (gigabyte). + - hugepages: number of hugepages of hugepagesz size. Huge page memory will be + used for OVS as well as each nova instance spawned. It is a good idea to + allocate the maximum number possible, while still leaving some non-huge page + memory available to other processes (nova-compute, etc). + - isolcpus: comma-separated list of CPUs to isolate from the kernel. Isolated + CPUs will be used for pinning OVS and libvirtd to. + +Under the performance->Compute->ovs section, edit as follows: + - socket_memory: the amount of huge page memory in MB to allocate to allocate + per socket to OVS as a comma-separated list. It is best to allocate the + memory to the socket which is closest to the PCI-Express bus of the NIC + to be used with OVS DPDK for tenant traffic. + - pmd_cores: comma-separated list of cores to pin to the poll-mode driver in + OVS. OVS DPDK will spawn TX/RX PMD threads to handle forwarding packets. + This setting identifies which cores to pin these threads to. For best + performance, dedicate at least 2 isolated cores on the same NUMA node where + socket_memory was assigned. + - dpdk_cores: comma-separated list of cores to pin OVS lcore threads to. + These threads do validation and control handling and it may not have any + impact on performance to include this setting. + +Under the performance->Compute section. Add a nova subsection and include +the following setting: + - libvirtpin: comma-separated list of CPUs to pin libvirt (nova) instances to. + For best results, set this to be one or more CPUs that are located on the + same NUMA node where OVS socket memory was dedicated. + +Now deploy with the modified deploy settings file. + +Limitations, Issues and Workarounds +=================================== + +* _APEX-415 br-phy dpdk interfaces are not brought up by os-net-config + +References +========== + +For more information on the OPNFV Euphrates release, please visit +http://www.opnfv.org/euphrates |