Server 2008 Slow Transfers

I have 2 Vmware hosts running ESX 4.1 build 348481. All of my vm guests are Server 2008 STD and ENT boxes. When I transfer files between them i get between 10-30 MB/s. Which is really low. All my guests connect at gigabit speeds and are running the Vmnet 3 driver. VMs are hooked to the same VSwitch. I know there are alot of people with the same issue, but I have been unable to find a fix.

Ive tried the following

Disable SMB2
Disable Auto Tuning.
Disable all offloads
Verified Duplex and Speed settings.
Uninstalled AV Product for testing
No firewall on guests.
LVL 6
MISOperationsAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What has helped others with Windows 2008 network issues

- Disable SMB2 (49MB/Sec vs 80+MB/sec) in Windows
- Disabled Chimney in Windows
- Turned NetDMA on in the BIOS
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Sajid Shaik MSr. System AdminCommented:
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MISOperationsAuthor Commented:
Is it possible that an upgrade to ESXi5 , New VM Tools, could remedy this issue?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
This is is reported across different versions of hosts.

You could try.
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