SplitRX Mode is a VMware vSphere feature that can improve network performance for some multicast workloads.
SplitRX Mode uses multiple physical CPUs to process network packets received in a single network queue. The feature allows the administrator to specify which virtual network interface cards should process packets in a separate context.
SplitRX Mode can improve performance for some workloads, including when multiple virtual machines (VMs) on the same host are receiving multicast traffic from the same source. However, SplitRX adds CPU overhead, so it can actually hurt performance in other scenarios. SplitRx Mode is only compatible on vNICs that use the VMXNET3 adapter.
SplitRX Mode was introduced in VMware vSphere 5.0.