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vSphere High Performance Essentials by Christian Stankowic

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Network offloading

To improve networking performance, it is possible to make use of offloading technologies. It's a common procedure to enable the following two flavors:

  • For TCP Segmentation Offload (TSO), packet segmentation is done by NIC instead the ESXi host's CPU
  • For Large Receive Offload (LRO), incoming packets are aggregated in fewer but larger buffers, reducing the number of total packets to be processed

To use these technologies properly, both the ESXi host, including the physical NICs and the VM, need to support it. LRO can also be configured in a software mode if the physical NIC does not offer hardware offloading. Basically, enabling offloading results in higher performance; however, some older guest operating systems and drivers have ...

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