Windows 7 / Networking

Configuring System-Wide QoS Settings

After creating a policy, you can edit it by right-clicking it in the details pane of the Group Policy Object Editor and then clicking Edit Existing Policy. You can configure system-wide QoS settings within the Computer Configuration\Policies\Administrative Templates\Network\ QoS Packet Scheduler node of Group Policy. You must modify these settings only if you must limit the outstanding packets, limit the bandwidth that can be reserved, or change the Packet Scheduler timer resolution. The following policies are available in the QoS Packet Scheduler node:

  • Limit Outstanding Packets Specifies the maximum number of outstanding packets that can be issued to the network adapter at any given time. When this limit is reached, new packets are queued until the network adapter completes a packet, at which point a previously queued packet is removed from the Pacer.sys queue and is sent to the network adapter. This setting is disabled by default, and you should never need to enable this setting.
  • Limit Reservable Bandwidth Controls the percentage of the overall bandwidth that the application can reserve. By default, this is set to 20 percent, which provides 80 percent of bandwidth to processes that do not have reserved bandwidth.
  • Set Timer Resolution This value is not supported and should not be set.

The QoS Packet Scheduler node also has the following three subnodes that you can use to manually configure the standard DSCP values:

  • DSCP Value Of Conforming Packets These settings apply to packets that comply with flow specifications.
  • DSCP Value Of Non-Conforming Packets These settings apply to packets that do not comply with flow specifications.
  • Layer-2 Priority Value These settings specify default link-layer priority values for networks that support it.

You will need to change the values contained in these subnodes only if you have configured your network infrastructure to use nonstandard DSCP values.

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In this tutorial:

  1. Configuring Windows Networking
  2. Usability Improvements
  3. Network And Sharing Center
  4. Network Explorer
  5. How Windows Finds Network Resources
  6. How Windows Publishes Network Resources
  7. How Windows Creates the Network Map
  8. Network Map
  9. Set Up A Connection Or Network Wizard
  10. Manageability Improvements
  11. Network Location Types
  12. Policy-Based QoS
  13. Selecting DSCP Values
  14. Planning Traffic Throttling
  15. Configuring QoS Policies
  16. Configuring System-Wide QoS Settings
  17. Configuring Advanced QoS Settings
  18. Testing QoS
  19. Windows Firewall and IPsec
  20. Windows Connect Now in Windows 7
  21. Core Networking Improvements
  22. Networking BranchCache
  23. How Hosted Cache Works
  24. How Distributed Cache Works
  25. Configuring BranchCache
  26. BranchCache Protocols
  27. File Sharing Using SMB
  28. Web Browsing with HTTP (Including HTTPS)
  29. DNSsec
  30. GreenIT
  31. Efficient Networking
  32. What Causes Latency, How to Measure It, and How to Control It
  33. TCP Receive Window Scaling
  34. Scalable Networking
  35. Improved Reliability
  36. IPv6 Support
  37. 802.1X Network Authentication
  38. Server Message Block (SMB) 2.0
  39. Strong Host Model
  40. Wireless Networking
  41. Improved APIs
  42. Network Awareness
  43. Improved Peer Networking
  44. Services Used by Peer-to-Peer Networking
  45. Managing Peer-to-Peer Networking
  46. Peer-to-Peer Name Resolution
  47. EAP Host Architecture
  48. Layered Service Provider (LSP)
  49. Windows Sockets Direct Path for System Area Networks
  50. How to Configure Wireless Settings
  51. Configuring Wireless Settings Manually
  52. Using Group Policy to Configure Wireless Settings
  53. How to Configure TCP/IP
  54. DHCP
  55. Configuring IP Addresses Manually
  56. Command Line and Scripts
  57. How to Connect to AD DS Domains
  58. How to Connect to a Domain When 802.1X Authentication Is Not Enabled
  59. How to Connect to a Domain When 802.1X Authentication Is Enabled