Speed up NFS file shares on Windows -

Auto tuning of Receive window is enabled by default in Windows 7/Vista to speed up the TCP connections. But this may affect performance if the firewall or network is old.

Possible TCP/IP Auto Tuning Related Problems:

• Indefinite delay (hang) when opening the Certificate Services snap-in.
• Slow (sometimes no) group policy application.
• Trying to select a domain user in order to add that principal to a local security group (the object picker) would hang indefinitely.
• Instant Messaging is not working well. Sometimes not at all by not being able to sign in.
• Access to local file servers (EX: networked drives, etc.) are extremely slow and sometimes did not succeed at all (appears to hang).
• Internet connection problems.
• Extremely slow file transfers.
• Other strange unexplained network connecting issues.
• Wireless network connection problems
• Website browsing and downloads are extremely slow.

I have tried the steps mentioned below and I observed a drastic change in the speed of NFS share on windows machine

1     1. Launch command prompt as administrator.

2       2. Run “netsh interface tcp show global”

You will see –

C:\Users\akash>netsh interface tcp show global Querying active state... TCP Global Parameters ---------------------------------------------- Receive-Side Scaling State                     : enabled Chimney Offload State                              : automatic NetDMA State                                            : enabled Direct Cache Acess (DCA)                      : disabled Receive Window Auto-Tuning Level  : normal Add-On Congestion Control Provider      : none ECN Capability                                           : disabled RFC 1323 Timestamps                             : disabled

3       3. Run “netsh interface tcp set global autotuning=disabled”

4.      4. Repeat step 2 to confirm that Receive Window Auto-Tuning Level  is disabled now

Please try this out and share your experiences.