How can I configure the amount of bandwidth that Windows reserves for Quality of Service (QoS)?

A. QoS provides a guaranteed level of service for media-rich applications and some mission-critical applications. By default, Windows reserves only 20 percent of the connection bandwidth for QoS. To adjust this setting in the registry, perform the following steps:

  1. Start a registry editor (e.g., regedit.exe).
  2. Navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PSched\Parameters\Adapters\\{\} registry subkey.
  3. From the Edit menu, select New, DWORD Value.
  4. Enter the name NonBestEffortLimit, then press Enter.
  5. Double-click the new value, set it to the new level (e.g., 50 in decimal base), then click OK.
  6. Restart the computer for the change to take effect.
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.