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HP Integrity Virtual Machines Version 4.0 Release Notes > Chapter 7 Networking Information

Calculating the Actual Utilization of the Virtual Network Card


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The emulation of the virtual network I/O card is based on the Intel I8254X family. Thus, the virtual network card (vNIC) is presented to the guest operating system as PCI-X 1000Base-T with the speed of 1 Gb regardless of the physical network interface card backing the vswitch. This emulation could lead to an incorrect calculation of vNIC performance by some network performance applications on the guest. For example, on a Windows guests, the Task Manager —> Network Performance display shows 1 Gb utilization. All calculations on the Windows utilization are then based upon this value rather than the speed of the backing device on the VM Host.

To accurately calculate vNIC performance, take into consideration the speed of the backing device on the Integrity VM Host.

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