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File transfer speeds are slower than expected.
Ethernet Routing Switch 4000 / 5000 running any software version.

A few potential reasons are:

1. Incorrect queue set settings

2. Auto-tuning feature which might have been enabled

3. Hardware issue with the ports or switch itself.


Please try steps below to resolve the issue:

1. On the switch try decreasing the queue set value i.e. try  changing the Queue set from 4 to Queue set 2, which is more buffer efficient with larger buffers. 

1. Type enable
2. Type configure terminal
3. Type qos agent buffer maximum 
4. Type qos agent oper-mode enable
5. Type qos agent oper-mode enable
6. Type qos agent queue-set 2


Note: "qos agent buffer maximum" allows for maximum amount of resource sharing

2. Disable auto-tuning on the Windows 7 machines

3. Check / change cables and review port stats on switch for FCS errors or any sign of potential hardware failure.

Additional notes
"To disable the Receive Window Auto-Tuning feature for HTTP traffic, follow these steps:
  1. Log on to the computer as a user who has administrative credentials.
  2. Click Start, type runas /user: local_computer_name\administrator cmd in the Start Search box, and then press ENTER.
  3. When you are prompted for the administrator account password, type the correct password, and then press ENTER.
  4. At the command prompt, type the following command, and then press ENTER:
    netsh interface tcp set global autotuninglevel=disabled
  5. Exit the Command Prompt window.
  6. Restart the computer."



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