Two Windows 2008 R2 virtual machines, one as iperf server and the other as client, with the test running in 30 seconds.Īs noted in the Task Manager view the 1 Gbit link speed was maxed out. Test 1: Windows 2008 R2 with the default E1000 adapter (It shall of course be noted that the following results are just observations from tests on one specific hardware and ESXi configuration, and is not in any way a “scientific” study.) More on possible tweakings of the VMXNET3 card settings will be explained in a later article. ![]() ![]() The test was done on HP Proliant Bl460c Gen8 with the virtual machines were running on the same physical host to be able to see the network performance regardless of the physical network connection between physical hosts/blades.Īll settings on the E1000, E1000E and VMXNET3 was default. I have found that the following iperf settings generates the best combination for network throughput tests on Windows Server:Ĭlient: iperf -c -P 16 -w 64k -l 128k -t 30 To generate large amounts of network traffic I used the iperf tool running on two virtual machines, one iperf “client” and the other as “server”. In this article we will test the network throughput in the two most common Windows operating systems today: Windows 2008 R2 and Windows 2012 R2, and see the performance of the VMXNET3 vs the E1000 and the E1000E. In the first article the general difference between the adapter types was explained. Network performance with VMware paravirtualized VMXNET3 compared to the emulated E1000E and E1000.
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