一般来说，带宽是数据在您的计算机上来回传输的速率。换言之，带宽是数据传输覆盖的上限和下限之间的范围。带宽^(Bandwidth)通常由您的Internet 服务提供商^{( Internet Service Provider)}( ISP ) 控制。但是， Windows^(Windows)中存在一些设置，通过配置您可以限制系统的可保留带宽。

首先，Windows为其应用程序需求和操作目的保留一定数量的带宽。通过在组策略^{(Group Policy)}中配置其设置，您可以轻松地限制可预留带宽。本文将逐步向您展示如何访问或打开 Windows 11/10/8 上的可预留带宽。

^{(Limit Reservable Bandwidth Setting)}在Windows 11/10限制可保留带宽设置

1.按Windows Key + R组合，在运行^(Run) 对话框中输入put gpedit.msc并按^(gpedit.msc)Enter打开本地组策略编辑器^{(Local Group Policy Editor)}。顺便说一下，组策略编辑器在^{(Group Policy Editor)}Windows Home版本中不可用。它仅在Windows Pro、Enterprise等版本中可用，

2.导航到这里：

Computer Configuration -> Administrative -> Network -> Qos Packet Scheduler

3.在此窗口的右窗格中，查找名为“限制可保留带宽^{(Limit reservable bandwidth)}”的设置，默认情况下它必须显示“未配置”^{(Not Configured )}状态。双击^(Double)相同的设置进行修改：

This policy setting determines the percentage of connection bandwidth that the system can reserve. This value limits the combined bandwidth reservations of all programs running on the system. By default, the Packet Scheduler limits the system to 80 percent of the bandwidth of a connection, but you can use this setting to override the default. If you enable this setting, you can use the “Bandwidth limit” box to adjust the amount of bandwidth the system can reserve. If you disable this setting or do not configure it, the system uses the default value of 80 percent of the connection. If a bandwidth limit is set for a particular network adapter in the registry, this setting is ignored when configuring that network adapter.

4.现在，在上面显示的窗口中，选择启用^(Enabled)并在选项^(Options)部分；您可以输入限制带宽的百分比。如果在此处输入0%^{(0 percent)}，则可以获得系统预留的预留带宽。更新^(UPDATE)：请阅读下面的说明。

单击Apply，然后单击OK。您现在可以关闭本地组策略编辑器^{(Local Group Policy Editor)}并使用获得的带宽重新启动系统。

如果您的Windows版本未附带Gpedit，那么您可以打开Regedit并导航到以下注册表项：

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched

给它价值数据0。如果Psched不存在，则创建它。

Hope you find the tip useful!

管理员于 2014 年 1 月 9 日发布的说明：^{(NOTE BY ADMIN posted on 09 Jan 2014:)}

声称 Windows总是为^(always)QoS保留一定百分比的可用带宽是不正确的。100% 的网络带宽可供所有程序共享，除非^(unless)程序特别请求优先带宽。除非请求程序正在发送数据，否则此“保留”带宽仍可供其他程序使用。如果保留带宽的程序没有发送足够的数据来使用它，则保留带宽的未使用部分可^{(is available)}用于同一主机上的其他数据流，KB316666表示。

那么如果将可预留带宽的限制更改为零会发生什么情况呢？^{(So what will happen if you change the limit of the reservable bandwidth to zero?)}

这是微软不得不说的^{(to say)}：

Windows 操作系统^{(Windows Operating System)}为QoS或服务^(Service)质量^(Quality)使用（如Windows更新、许可证更新等）保留了Internet总带宽的固定百分比。因此，当您将操作系统的 Reservable Bandwidth限制为 0 时，^(Bandwidth)这将影响操作自动 Windows 更新等系统活动^{(this will affect the operating system activities like Automatic Windows Updates)}。如果QoS 感知^(QoS-aware)应用程序保留的带宽多于它使用的带宽，则未使用的保留带宽可供其他应用程序使用。预留并不能确保带宽可用于QoS 感知^(QoS-aware)应用程序，因为不支持 QoS 的^(QoS-aware)应用程序可能会消耗太多带宽。

有关TechNet^(TechNet)的更多详细信息。^{(More details on TechNet.)}

Limit Reservable Bandwidth Setting in Windows 11/10

In generаl, bandwidth is the rate at which data travels to and fro from your computer. Іn other words, bandwidth is the rangе covered for data transmission between an upреr rаnge and a lower range. Bandwidth is usυally controlled by your Internet Service Provider (ISP). However, there exist some settings in Windows, by configuring which you limit the reservable bandwidth for your system.

Primarily, Windows reserves a certain amount of bandwidth for its application requirements and operation purposes. By configuring its setting in the Group Policy, you can easily limit the reservable bandwidth. This article will show you stepwise, how to access or open up the reservable bandwidth on your Windows 11/10/8.

Limit Reservable Bandwidth Setting in Windows 11/10

1. Press Windows Key + R combination, type put gpedit.msc in Run dialog box and hit Enter to open the Local Group Policy Editor. The Group Policy Editor, incidentally, is not available in Windows Home version. It is available only in Windows Pro, Enterprise, etc., versions,

2. Navigate here:

Computer Configuration -> Administrative -> Network -> Qos Packet Scheduler

3. In the right pane of this window, look for the settings named Limit reservable bandwidth, it must be showing a Not Configured status by default. Double click on the same setting to modify it:

This policy setting determines the percentage of connection bandwidth that the system can reserve. This value limits the combined bandwidth reservations of all programs running on the system. By default, the Packet Scheduler limits the system to 80 percent of the bandwidth of a connection, but you can use this setting to override the default. If you enable this setting, you can use the “Bandwidth limit” box to adjust the amount of bandwidth the system can reserve. If you disable this setting or do not configure it, the system uses the default value of 80 percent of the connection. If a bandwidth limit is set for a particular network adapter in the registry, this setting is ignored when configuring that network adapter.

4. Now, in the above-shown window, select Enabled and in the Options section; you could input the percentage for limiting the bandwidth. If you input 0 percent here, you can gain the reserved bandwidth reserved by the system. UPDATE: Do read the note below.

Click Apply, followed by OK then. You may now close the Local Group Policy Editor and reboot the system with gained bandwidth.

If your version of Windows does not ship with Gpedit, then you may open Regedit and navigate to the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched

Give it Value Data 0. If Psched does not exist, create it.

Hope you find the tip useful!

NOTE BY ADMIN posted on 09 Jan 2014:

The claim that Windows always reserves a percentage of the available bandwidth for QoS is incorrect. One hundred percent of the network bandwidth is available to be shared by all programs unless a program specifically requests priority bandwidth. This “reserved” bandwidth is still available to other programs unless the requesting program is sending data. If the program that reserved the bandwidth is not sending sufficient data to use it, the unused part of the reserved bandwidth is available for other data flows on the same host, says KB316666.

So what will happen if you change the limit of the reservable bandwidth to zero?

Here is what Microsoft has to say:

The Windows Operating System reserves a fixed percentage of the total Internet bandwidth for the QoS or Quality of Service usage like Windows update, license renewal, etc. Thus, when you limit the Reservable Bandwidth of the operating system to 0, this will affect the operating system activities like Automatic Windows Updates. If a QoS-aware application reserves more bandwidth than it uses, then the unused, reserved bandwidth is available for use by other applications. The reservation does not ensure that the bandwidth will be available to the QoS-aware application because applications that are not QoS-aware might consume too much bandwidth.

More details on TechNet.

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