PaulAngus commented on a change in pull request #28: DPDK vHost User mode
selection
URL:
https://github.com/apache/cloudstack-documentation/pull/28#discussion_r271368976
##########
File path: source/plugins/ovs-plugin.rst
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@@ -364,6 +364,47 @@ To enable DPDK on VM deployments:
dpdk-interface-model:
<model type='virtio'/>
+Additional configurations on service offerings
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+It is also possible to avoid passing additional configuration on each VM
deployment, but setting these configurations on a service offering, and those
are passed to the VM. To create a service offering with additional
configurations, pass each key/value pair as service offering details on service
offering creation, with keys starting with the "extraconfig" keyword, and each
value an URL UTF-8 encoded string. For example:
+
+::
+
+ create serviceoffering name=<NAME> displaytext=<NAME>
serviceofferingdetails[0].key=extraconfig-dpdk-hugepages
serviceofferingdetails[0].value=%3CmemoryBacking%3E%20%3Chugepages%2F%3E%20%3C%2FmemoryBacking%3E
serviceofferingdetails[1].key=extraconfig-dpdk-numa
serviceofferingdetails[1].value=%3Ccpu%20mode%3D%22host-passthrough%22%3E%20%3Cnuma%3E%20%3Ccell%20id%3D%220%22%20cpus%3D%220%22%20memory%3D%229437184%22%20unit%3D%22KiB%22%20memAccess%3D%22shared%22%2F%3E%20%3C%2Fnuma%3E%20%3C%2Fcpu%3E
+
+Additional configurations are stored as service offering details.
+
+DPDK vHost User mode selection
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The vHost user mode describes a client/server model between Openvswitch along
with DPDK and QEMU, in which one acts as client while the other as server. The
server creates and manages the vHost user sockets and the client connects to
the sockets created by the server:
+
+- DPDK vHost user server mode:
+ - Is the default configuration.
+ - OVS with DPDK acts as the server, while QEMU acts as the client.
+ - The port types used are: dpdkvhostuser
+
+- DPDK vHost user client mode:
+ - OVS with DPDK acts as the client and QEMU acts as the server.
+ - If Openvswitch is restarted then the sockets can reconnect to the
existing sockets on the server, and normal connectivity can be resumed.
+ - The port types used are: dpdkvhostuserclient
+
+It is possible to pass the DPDK vHost User mode as a service offering detail
with key: "DPDK-VHOSTUSER" and values: "client" or "server". The following
table illustrates the expected behaviour on DPDK ports and VM guest interfaces.
Review comment:
Can this only be passed via a service offering ?
Maybe the Mode options should be explained before the ability to embed dpdk
in the service offerings. And then the ability to use service offerings
explained separately
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