Figure 3.40 Network performance without vRSS enabled
Figure 3.41 Network performance with vRSS enabled
I do want to point out that there is no vRSS support in the host partition prior to
Windows Server 2016, but it is introduced in Windows Server 2016. This may not
seem important, because a host can normally just use RSS. It does become an issue,
though, if you create multiple virtual network adapters within the host OS that is
connected to a Hyper-V virtual switch. This is possible in Windows 2012 and above,
and it is something I talk about later in this chapter. Prior to Windows Server 2016,
virtual network adapters in the host partition would be limited in bandwidth to what
is possible through a single processor core for each virtual network adapter, but this is
not the case in Windows Server 2016.
Windows Server 2016 introduces another technology that builds on vRSS: Virtual
Machine Multi-Queue (VMMQ). With VMQ, a VM would be allocated a single queue
that was affinitized to a single processor core. Modern network adapters have huge