Larg Recieve Packets Dropped on virtual machines

Hi,

I asked this question before but no body could help me.

The issue is happening again. All our virtual machines are using VMXNET 3 as network card. The issue is happening just on some virtual machines that they are not hosting by same ESXi.

More than 4000 packets dropping in 5 or 10 minutes. I've read about ring size or buffer size in NICs but I think, it's not root cause because it's happening on virtual machines randomly with any specific pattern.

It's affecting my users sounds.

My environment specification:

1. Physical Server: HP DL585 G7
2. Hypervisor: ESXi 5.1 (Customized by HP)
3. vCenter 5.1
4. Client OS: Windows XP 64-bit SP2
5. NIC Type: VMXNET 3
6. vCPU per VM: 2
7. RAM per VM: 2GB
8. vSwitch with 2 physical NICs

Ask me if you need to more information, I should clear this issue from my environment permanently.

Thanks