I have a situation with several Windows 7 VMs which are observably under-performing with their network issues. They are all X64 with plenty of RAM and CPU and the vmxnet3 driver. And I know iperf is not ideal on Windows, but here is what we are seeing:
- W7 to W2K8 (with W2K8 as server) we get 200-300 Mbps
- W2K8 to W2K8 we get 900+ Mbps (when VMs are on the different hosts) and 3.8 Gbps (when the VMs are on the same host)
And when I go to a completely different environment and run the same tests, I get:
- W7 to W2K8 (with W2K8 as server) we get 800-900 Mbps (this is what I would expect)
- W2K8 to W2K8 we get 900+ Mbps (when VMs are on the different hosts) and 2.9 Gbps (when the VMs are on the same host)
First (under-performing) environment is Dell R620, second example (performing to expectation) is HP DL380
- all drivers up to date
- Install ESXi originally from VICs
Anyone have an idea?