Only the Server 2008 machines, poor network performance

The environment contains 2 x IBM x 3650 servers. The virtual machines that all have two 8 GB of RAM and 4 vCPUs allocated. ESXi 5.1 build 1065491


The network consists of about 40 machines Windows 7 (physical) and 2 servers (ESXi VMs) who are Server 2008 Std ed (one is a SBS 2008 but they are the same "under the hood"). The network is a gigabit w / D-Link switches. It started with me investigating slow network speeds.

I use iperf to nail down what is happening. It appears when a Win 7 machine is writing data to SMB in 2008 virtual machine, it works fine. But when the W 2008 Server VM tries to write data to SMB in the Win 7 (physical or virtual) machine, I got hurt. Difficulty is the very sporadic network speed jumps between 1 MB/s to 60 MB/s. On average, I'd be lucky to hit 20 to 30 Mbps which isn't even 50% of the gigabit network util.

At first I thought that the problem may be with the ESXi config so I gave a whole new Windows 7 VM on the same hypervisor which houses the two 2008 VMs server and re-ran the test - when I run a test of my workstation (physical) to the VM 7 Win, it works very well (90 to 100 MB/s both ways). If - Win 7 seems to be good, but both the VM Server 2008 I've got exposed the slow download issue.

So far, I did the following on Server 2008 VMs:

  • Replace the E1000 w / VMXNET3 NIC
  • Dissolved the 802.3ad aggregation of links to the ESXi servers
  • Make sure that energy saving is off
  • Disable Offload TCP segmentation
  • Uninstalled the AV in case the problem was some kind of antivirus real-time analysis
  • Place the virtual machine on the other x 3650 - the question of speed follows the virtual machine.

I can't think what to try next. Any advice or ideas welcome.

Here are the results of a test my W7 desktop for Server 2008 VM: http://pastebin.com/dGZKwxAr

Now the same test of my W7 desktop to and a W7 VM on the same ESXi host: http://pastebin.com/fugjCvjx

I did an upgrade on the spot of one of the virtual machines 2008 2008 R2 server and it solved the problem. I'm getting 100 + Mbps in both directions of Win 7 clients now. I think I'll do the same thing to the other server.

Tags: VMware

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