Thinwire 编辑

Introduction

Thinwire is the Citrix default display remoting technology used in XenApp and XenDesktop.

Display remoting technology allows graphics generated on one machine to be transmitted, typically across a network, to another machine for display.

A successful display remoting solution should provide a highly interactive user experience that is similar to that of a local PC. Thinwire achieves this by using a range of complex and efficient image analysis and compression techniques. Thinwire maximizes server scalability and consumes less bandwidth than other display remoting technologies.

Because of this balance, Thinwire meets most general business use cases and is used as the default display remoting technology in XenApp and XenDesktop.

Thinwire or Framehawk

Thinwire should be used for delivering typical desktop workloads, for example, desktops, office productivity or browser-based applications. Thinwire is also recommended for multi-monitor, high resolution or high DPI scenarios, and for workloads with a mixture of video and non-video content.

Framehawk should be used for mobile workers on broadband wireless connections where packet loss can be intermittently high.

HDX 3D Pro

In its default configuration, Thinwire can deliver 3D or highly interactive graphics, however enabling HDX 3D Pro mode during the installation of the VDA for Desktop OS is a good option for such scenarios. The 3D Pro mode configures Thinwire with full-screen H.264 encoding for graphics transmission. This provides a more fluid experience for 3D professional graphics. For more information, see HDX 3D Pro and GPU acceleration for Windows Desktop OS.

Requirements and considerations

• Thinwire has been optimized for modern operating systems, including Windows Server 2012 R2, Windows Server 2016, Windows 7, and Windows 10. For Windows Server 2008 R2, legacy graphics mode is recommended. Use the built-in Citrix policy templates, High Server Scalability-Legacy OS and Optimized for WAN-Legacy OS to deliver the Citrix recommended combinations of policy settings for these use cases.
• The policy setting which drives the behavior of Thinwire, Use video codec for compression, is available on VDA versions in XenApp and XenDesktop 7.6 FP3 and later. The Use video codec when preferred option is the default setting on VDA versions XenApp and XenDesktop 7.9 and later.
• All Citrix Receivers support Thinwire. Some Citrix Receivers may however support features of Thinwire that others do not, for example, 8 or 16-bit graphics for reduced bandwidth usage. Support for such features are automatically negotiated by Citrix Receiver.
• Thinwire will use more server resources (CPU, memory) in multi-monitor and high-resolution scenarios. It is possible to tune the amount of resources Thinwire uses, however, bandwidth usage may increase as a result.
• In low bandwidth or high latency scenarios, you may consider enabling 8 or 16-bit graphics to improve interactivity, however visual quality will be affected, especially at 8-bit color depth.

Configuration

Thinwire is the default display remoting technology.

The following Graphics policy setting sets the default and provides alternatives for different use cases:

• Use video codec for compression
  • Use video codec when preferred. This is the default setting. No additional configuration is required. Keeping this setting as the default ensures that Thinwire is selected for all Citrix connections, and is optimized for scalability, bandwidth, and superior image quality for typical desktop workloads.
• Other options in this policy setting will continue to use Thinwire in combination with other technologies for different use cases. For example:
  • For actively changing regions. The adaptive display technology in Thinwire identifies moving images (video, 3D in motion) and uses H.264 only in the part of the screen where the image is moving.
  • For the entire screen. Delivers Thinwire with full-screen H.264 to optimize for improved user experience and bandwidth, especially in cases with heavy use of 3D graphics.

A number of other policy settings, including the following Visual display policy settings can be used to fine tune the performance of display remoting technology and are all supported by Thinwire:

• Preferred color depth for simple graphics
• Target frame rate
• Visual quality

To get the Citrix recommended combinations of policy settings for different business use cases, use the built in Citrix Policy templates. The High Server Scalability and Very High Definition User Experience templates both use Thinwire with the optimum combinations of policy settings for your organization’s priorities and your users’ expectations.

Monitoring Thinwire

You can monitor the use and performance of Thinwire from Citrix Director. The HDX virtual channel details view contains useful information for troubleshooting and monitoring Thinwire in any session. To view Thinwire-related metrics:

1. In Director, search for a user, machine or endpoint, open an active session and click Details. Or, you can select Filters > Sessions > All Sessions, open an active session and click Details.

2. Scroll down to the HDX panel.

1. Select Graphics - Thinwire.