To use Large Receive Offload (LRO) on a VMXNET3 adapter on a virtual machine that runs Windows 8 and later or Windows Server 2012 and later, you must enable LRO globally on the guest operating system. On Windows, the LRO technology is also referred to as Receive Side Coalescing (RSC).
- To verify whether LRO is disabled globally on a Windows 8 and later or Windows Server 2012 guest OS, run the netsh int tcp show global command at the command prompt.
netsh int tcp show global
The command displays the status of the global Transmission Control Protocol (TCP) parameters that are set on the Windows 8.x OS.
TCP Global Parameters ---------------------------------------------- Receive-Side Scaling State : enabled Chimney Offload State : disabled NetDMA State : disabled Direct Cache Access (DCA) : disabled Receive Window Auto-Tuning Level : normal Add-On Congestion Control Provider : none ECN Capability : disabled RFC 1323 Timestamps : disabled Initial RTO : 3000 Receive Segment Coalescing State : disabled
If LRO is globally disabled on the Windows 8 and later or Windows Server 2012 machine, the Receive Segment Coalescing State property appears as disabled.
- To enable LRO globally on the Windows OS, run the netsh int tcp set global command at the command prompt:
netsh int tcp set global rsc=enabled
What to do next
Enable LRO for the VMXNET3 adapter on the Windows 8 and later or Windows Server 2012 virtual machine. See Enable or Disable LRO on a VMXNET3 Adapter on a Windows Virtual Machine.