How to Change Jumbo Frame Size Using Regedit

Jumbo frames allow network adapters to transmit Ethernet frames larger than the standard 1500 bytes—typically up to 9000 or 9014 bytes—which can reduce CPU overhead and improve throughput on supported local networks. While this setting is commonly toggled through the Device Manager interface, it can also be configured directly via the Windows Registry Editor (regedit). This guide provides the direct steps to locate your specific network interface subkey and modify the maximum jumbo frame payload size.

Step 1: Open the Registry Editor

  1. Press Windows Key + R to open the Run dialog box.
  2. Type regedit and press Enter or click OK.
  3. Confirm the User Account Control (UAC) prompt if prompted.

Step 2: Navigate to the Network Class Key

In the Registry Editor address bar, navigate to the following path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}

Step 3: Locate Your Network Adapter

  1. Under the {4d36e972-e325-11ce-bfc1-08002be10318} key, you will see a list of numbered subfolders (such as 0000, 0001, 0002).
  2. Click through each numbered folder and inspect the DriverDesc value in the right-hand pane.
  3. Identify the folder corresponding to the specific physical network adapter you wish to configure (for example, Intel(R) Ethernet Controller or Realtek PCIe GbE Family Controller).

Step 4: Adjust the Jumbo Frame Payload Value

  1. In the selected adapter’s folder, look for a value named *JumboPacket or JumboPacket.
  2. If the value does not exist, right-click an empty area in the right-hand pane, select New > String Value (or DWORD (32-bit) Value, depending on your specific network driver’s specification), and name it *JumboPacket.
  3. Double-click *JumboPacket to edit it.
  4. Set the Value data to your desired payload size in bytes. Standard common values include:
    • 1514 (Standard / Disabled)
    • 4088 (4KB MTU)
    • 9014 (9KB MTU)
  5. Click OK to save the changes.

Step 5: Apply the Changes

Registry changes to network adapters do not take effect immediately. To apply the new frame size: