QoS Packet Scheduler

[Memo]

What does this service in Win XP do? Do I need it or should I remove it? It's on by defualt.

[qmanchu]

No, unless you're in a corporate networking environment, it's of no use to you. As a matter of fact, unless you have routers that support QoS, it's of little use at all. It is my understanding that it is primarily used to prioritize network traffic and lower the latency of multimedia streams. Hope this helps.

[Red Label]

From http://www.speedguide.net/Cable_mode...e_reg_xp.shtml

"Increase bandwidth by tweaking QoS in Windows XP Pro


The following tweak applies only to Windows XP Professional edition.

The default system behavior is that all 100% bandwidth is available, however, if there is a running application that indicates to the OS it needs to send high priority/real time data, then as long as it has the socket open, Windows XP will restrict “best effort” traffic to 80% of the bandwidth so that high priority traffic can be accommodated. Basically, applications can make this request to the operating system for QoS support using the QoS application programming interfaces (APIs) in Windows and this only applies if a specific app is requesting QoS.

If you'd like to change how much bandwidth is reserved for QoS (the default is 20% of the total bandwidth), do the following:

1. Make sure you're logged in as "Administrator" (not just any account with admin privileges).
2. Navigate to START>Run and type: gpedit.msc
3. Navigate to Local Computer Policy > Administrative Templates > Network > QOS Packet Scheduler
4. In the right window, double-click the limit reservable bandwidth setting
5. On the setting tab, check the enabled setting.
6. Where it says "Bandwidth limit %", change it to read 0 (or whatever percentage you want to reserve for high priority QoS data)
7. Click OK, close gpedit.msc

Under START > My Computer > My Network Connections > View Network Connections, right-click on your connection and under Properties (where it lists your protocols), make sure QOS Packet Scheduler is enabled.

You need to reboot for changes to take effect.

Note: This tweak applies only to The Professional version of Windows XP."

[LPMiller]

it's also false, from what I understand. It reserves 20 percent, but you still get to use it unless a specific app actually requests that 20 percent. Only certain apps do, so usually, you'll have that 100 percent available.

The proof of this is that if you have it on, and perform a download, or have it off and perform a download, you don't see any actual difference at all.