Re-examine Windows XP's 20% reserved bandwidth

Since Windows XP or 2003 has 20% "reserved bandwidth", there is a corollary: after removing the speed by 20%, xp has done a lot of work on the bandwidth. These claims are widely popular on the Internet. However, after taking time and effort to remove this restriction, you find that the speed has not improved!
As far as I know, this method was originally from the "Computer Newspaper", until today, the so-called "skills" It is also widely circulated on the Internet. So, I think it is necessary to talk about it here.

In fact, there is no need to remove it.

This 20% bandwidth is not "reserved", meaning that programs using the QoS Application Programming Interface (API) can request up to 20% of the bandwidth on each interface base link, but if The program is not fully utilized and these bandwidths can still be used by other programs.

In Microsoft's Technical Resource Planning, it is stated that applications running on Windows XP PCs can share all network bandwidth unless an application specifically requests priority bandwidth. But if the requesting application does not send data, then these "scheduled" bandwidths are still available to other applications.

By default, for the underlying link on each interface of the end system, the application can reserve a total aggregate bandwidth of up to 20% of the base link speed. If the bandwidth-deferred application does not send enough data to make full use of the bandwidth, the unused portion of the predetermined bandwidth will still be available for other data streams on the same host.

Visible, the so-called 20% reserved bandwidth is purely out of context, misleading audio and video.

If you must turn it off, you can follow these steps:

1. Run the Group Policy Editor program (gpedit.msc). In the "Local Computer" policy, expand the "Computer Configuration" → "Administrative Templates" → "Network" → "QoS Packet Scheduler" branch. The QoS Packet Scheduler policy appears on the right side of the screen. (learning computer)

2. Click "Limit to reserve bandwidth" in the right sub-item. Click Properties next to Show under Limit Reserved Bandwidth. Click "Settings." "Settings" gives us three choices (unconfigured, enabled, disabled), select "Enabled", then set the % next to the bandwidth limit to 0%, then press OK to exit.

3. Click "Start" → "Connect to" → "Show all connections". Select the connection you have made, right-click on the property, click on the network in the connection properties that appear, in the displayed network dialog box, check if "QoS packet scheduler" is used in "This connection uses the following items" Ticked, press OK to exit without any problems.