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Network performance in Server 2.0

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Hi all,

 

I've tried quite a lot by now, and I'm still puzzled if I can ever get this to perform well:

Host: 2xXeon 2.6GHz, 4GB RAM, Debian Squeeze, Intel Gigabit Ethernet onboard (e1000)

Guest: Windows XP, 2.5GB RAM

 

I can not get it to have decent network performance. Here's what I tried:

- 1vCPU/2vCPU -> 1 vCPU performance is slightly better

- flexible/vmxnet/e1000 Adapter -> vmxnet ist best, but very minor differences

- TCP tuning in the Windows Registry -> no effect

 

Performance varies with the above parameters changed between 100 and 180 MBit/s, which is far too slow I think. Also, guest CPU usage is very high whenever heavy network traffic is on.

 

For comparison I installed a second VM with Debian Squeeze,  without any modification except to install VMware tools I get ~250MBit with pcnet32 and ~350MBit with vmxnet. I suspect that e1000 will perform even better.

 

I have by now followed about every advice to improve network performance, all to no avail.

 

I have even tried ESX 3.5 (these are 32bit processors), but the host system has a huge software RAID, which did not perform well at all when re-created in a VM in ESX.

 

Is this just something I have to live with, or is there another secret trick which I haven't discovered yet?

 

TIA!

 

Stefan


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