Slow SMB transfer on Windows 2012R2

Hi,
i have ESXi host with windows 2012R2 and Windows 2008R2 which has 1Gbit network. I am trying to copy a folder from win 2008R2 which is 57MB and has 4084 files. When this folder from win 2008r2 to win 2008r2 i am getting about 10MB/s, but when i copy that
same folder to win2012r2 i am getting transfer speed of 3-4MB/s
I tried following:
Set-SmbServerConfiguration -EnableSMB2Protocol $false
See:
http://support.microsoft.com/kb/2696547/en-us
Note: This is just for testing and you can enable it after testing.
If it is SMB related, try to disable the TCP Chimney Offload, Receive Side Scaling and Network Direct Memory Access features.
Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008
http://support.microsoft.com/kb/951037
Here are the steps to disable RSS, TCP Chimney Offload and NetDMA:
netsh int tcp set global rss=disabled
netsh int tcp set global chimney=disabled
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters, double-click the EnableTCPA registry entry.
Note: If this registry entry does not exist, right-click Parameters, point to New, click DWORD Value, type EnableTCPA, and then press ENTER.
To disable NetDMA, type 0 in the Value data box, and then click OK.
I also tried to disable SMB signing (http://mctexpert.blogspot.com/2011/02/disable-smb-signing.html) but no help.
VMs have same configuration (vCPU and memory) What i noticed on 2012r2 is that explorer takes about 23% of CPU while doing copy while on 2008r2 cpu usage is 11%.
I came to a point where i don't know where to look for a problem anyone maybe had same issues? Btw it is NOT vmware problem :).

Hi,
Please try to copy a large file. If the speed is normal, it means that is should not be a SMB issue.
Also, please try to perform a network capture on the server. Check if there are a lot of TCP retransmission in the capture data.
If there is no retransmission, the speed of transmission should be limited by performance of the disk.
To download network monitor, please refer to the link below,
https://www.microsoft.com/en-us/download/details.aspx?id=4865
Best Regards.
Steven Lee
TechNet Community Support

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