Users Guide

16–Windows Server 2019
Windows Server 2019 Behaviors
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Known Event Log Errors
Under typical operation, the dynamic algorithm of RSSv2 may initiate an
indirection table update that is incompatible with the driver and return an
appropriate status code. In such cases, an event log error occurs, even though no
functional operation issue exists. Figure 16-1 shows an example.
Figure 16-1. RSSv2 Event Log Error
Windows Server 2019 Behaviors
Windows Server 2019 introduced the following new behaviors affecting adapter
configuration.
VMMQ Is Enabled by Default
In the inbox driver of Windows Server 2019, the Virtual Switch RSS (VMMQ)
option is enabled by default in the NIC properties. In addition, Microsoft changed
the default behavior of the Virtual NICs option to have VMMQ enabled with the
16 queue pairs. This behavior change impacts the quantity of available resources.
For example, suppose the NIC supports 32 VMQs and 64 queue pairs. In
Windows Server 2016, when you add 32 virtual NICs (VNICs), they will have VMQ
acceleration. However in Windows Server 2019, you will get 4 VNICs with VMMQ
acceleration, each with 16 queue pairs and 30 VNICs with no acceleration.
Because of this functionality, Marvell introduced a new user property, Max Queue
Pairs (L2) Per VPort. For more details, see New Adapter Properties.
Inbox Driver Network Direct (RDMA) Is Disabled by Default
In the inbox driver of Windows Server 2019, the Network Direct (RDMA) option is
disabled by default in the NIC properties. However, when upgrading the driver to
an out-of-box driver, Network Direct is enabled by default.