Web Reference: You can only disable hyperthreading on VM sizes that use hyperthreading by default (for example, VMs with 2 threads per core). You can only reduce the number of vCPUs, not increase it beyond the VM's default. I was having a conversation about Hyperthreading with a colleague, and we discussed that with the introduction of the entire class of side channel attacks, some of the security guidance includes turning off HT as a preventive security measure. Please keep in mind that by disabling hyper threading, we can adversely impact the performance on the VMs. With this setting, there can be cases where there is no core to which a descheduled virtual machine can be migrated, even though one or more logical cores are idle.
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