QoS doesn’t work, except for one specific scenario:
Where QoS works is where one organisation controls both ends of a connection AND also tightly-defines and controls the applications:
A fixed-broadband provider can protect IP telephony & IPTV on home broadband between central office & the home gateway.An enterprise can build a private network & prioritise its most important application(s), plus maybe a connection to a public cloud or UCaaS service.
Mobile operators can tune a 4G network to prioritise VoLTE.
Telco core and transport networks can apply differential QoS to particular wholesale customers, or to their own various retail requirements (eg enterprise users’ data vs. low-end consumers, or cell-site timing signals and backhaul vs. user data).
Industrial process & control systems use a variety of special realtime connection protocols and networks. Vendors of “OT” (operational technology) tend to view IT/telecoms and TCP/IP as quaint. The IT/OT boundary is the real “edge”.
This is not news, but it’s worthwhile repeating: it is actually cheaper to build a network that can carry the traffic than building a network that keeps quality promises on a backbone that is undersized or close to capacity. Overprovisioning works, everything else does not, economically as well as technically.
Just in case you are maintaining Delphi code for several older versions of Delphi: Be aware that the declarations of NativeInt and NativeUInt are wrong in some of them.
An item that provides click-through is one that a user can activate with one click, even though the item is in an inactive window. (To activate an item that does not support click-through, the user must first make the containing window active and then click the item.) Although click-through can make some user tasks easier, it can also confuse users if they click items unintentionally.
Click-through is not a property of a class of controls; any control, including toolbar items, can support click-through. This also means that you can support click-through for any subset of items; you don’t have to choose between supporting click-through for all items in a window or none. Follow the guidelines in this section so that you can support click-through when it’s appropriate.
Avoid providing click-through for an item or action whose result might be dangerous or undesirable. Specifically, avoid enabling click-through for an item that:
Performs a potentially harmful action that users can’t cancel (for example, the Delete button in Mail)
Performs an action that is difficult or impossible to cancel (such as the Send button in Mail)
Dismisses a dialog without telling the user what action was taken (for example, the Save button in a Save dialog that overwrites an existing file and automatically dismisses the dialog)
Removes the user from the current context (for example, selecting a new item in a Finder column that changes the target of the Finder window)
Clicking in any one of these situations should cause the window that contains the item to be brought forward, but no other action to be taken.
In general, it’s safe to provide click-through for an item that asks the user for confirmation before executing, even if the command ultimately results in destruction of data. For example, you can provide click-through for a delete button if you also make sure to give users the opportunity to cancel or confirm the action before it proceeds.
Think twice before supporting click-through for items that don’t provide confirmation feedback. Specifically, consider how dangerous the action might be, and determine how difficult it will be for the user to undo the action after it’s performed. For example, the Mail Delete button does not provide click-through because it deletes a message without asking for confirmation, which is a potentially harmful action that can be difficult to undo. On the other hand, click-through for the New button in Mail is fine because its resulting action is not harmful and is easy to undo.
Ensure that items that don’t support click-through appear disabled when their window is inactive. The disabled appearance helps users understand that these controls are unavailable. For example, the Delete and Mark as Junk buttons in the inactive Mail window shown below don’t support click-through.
The Wiert Corner - irregular stream of stuff 