Merge pull request #69713 from orelmisan/dpdk-cluster-config

[virt] DPDK cluster config: Enable AlignCPUs

Author: sjhala-ccs

modules/virt-configuring-cluster-dpdk.adoc

@@ -100,6 +100,20 @@ $ oc patch hyperconverged kubevirt-hyperconverged -n {CNVNamespace} \
 Editing the `HyperConverged` CR changes a global setting that affects all VMs that are created after the change is applied.
 ====
 
+. If your DPDK-enabled compute nodes use Simultaneous multithreading (SMT), enable the `AlignCPUs` enabler by editing the `HyperConverged` CR:
++
+[source,terminal,subs="attributes+"]
+----
+$ oc patch hyperconverged kubevirt-hyperconverged -n {CNVNamespace} \
+    --type='json' -p='[{"op": "replace", "path": "/spec/featureGates/alignCPUs", "value": true}]'
+----
++
+[NOTE]
+====
+Enabling `AlignCPUs` allows {VirtProductName} to request up to two additional dedicated CPUs to bring the total CPU count to an even parity when using
+emulator thread isolation.
+====
+
 . Create an `SriovNetworkNodePolicy` object with the `spec.deviceType` field set to `vfio-pci`:
 +
 .Example `SriovNetworkNodePolicy` manifest