QoS Does NOT Slow Bandwidth

Discussion in 'Windows Desktop Systems' started by Infinity7, Mar 2, 2002.

  1. Infinity7

    Infinity7 Guest

    At the Microsoft website in the Knowledge Base in article Q316666 they say the following about the QoS packet scheduler:

    Correcting Some Incorrect Claims About Windows XP QoS Support

    There have been claims in various published technical articles and newsgroup postings that Windows XP always reserves 20 percent of the available bandwidth for QoS. These claims are incorrect. The information in the "Clarification about QoS in End Computers That Are Running Windows XP" section of this article correctly describes the behavior of Windows XP systems.

    Clarification about QoS in End Computers That Are Running Windows XP

    As in Windows 2000, programs can leverage QoS through the QoS application programming interfaces (APIs) in Windows XP. 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. By default, programs can reserve up to an aggregate bandwidth of 20 percent of the underlying link speed on each interface on an end computer. If the program that reserved the bandwidth is not sending enough data to utilize it completely, the unused portion of the reserved bandwidth is available for other data flows on the same host.

    I guess that special tweak that "only XP Pro users can do" is not really doing anything at all.

  2. DarkSiege

    DarkSiege Guest

    Tweaking the bandwidth reservation actually increased my internet speed, but it usually depends on the internet congestion.
  3. Qumahlin

    Qumahlin Moderator


    If you noticed any difference it is just luck. QoS does NOT change your speed. Never will unless you are on a 100% QoS aware network, which unless your in a office building right now using some QoS apps that NEED a certain amt of bandwidth reserved you aren't.

    When people saw this post it made sense and they had the placebo effect...they thought it did something so they believed it did...kind of like how in drug tests some people get the real pill...some get the sugar pill...yet some people on the sugar pill says it helped them...it didn't help them, they just thought it helped them and you know the old saying, mind over matter :)
  4. HSChronic

    HSChronic Guest

    They are right QoS does not increase bandwith. Why?? Because by default 1. QoS is not installed, and 2. QoS reserves bandwith to programs that use a QoS scheduler which many programs well 99% of programs do not use that anyway.

    The only thing that will increase speeds some is the MTU tweaks and RWIN tweaks that you can get from www.speedguide.net
  5. Perris Calderon

    Perris Calderon Moderator Staff Member Political User

    new york
    qos IS installed by default, however, as the previous posts tell you, it does not take your bandwidTH...ON THE OTHER HAND...it does start on boot, and there's no reasin for this, THEREFORE, even if you have xp home, just go to your services and either dissable it, or set it to manual.....(of course you can uninstall it, but that'll serve no purpose) period, that's the end...
  6. pmcartney

    pmcartney Guest

    Indeed by default in PRO QoS is active and installed. If one does the gpedit.msc in start>run and get into QoS it (as it MS) included that it DOES use 20% whether you like it or not.

    You have to leave it installed, enable it and change the value to ZERO percent. My ping rate and web page to page has gone up greatly since this.

    Also make sure you review this entire board (not the forum) for "how to use XP" and remove services that are not used at home. You WILL see speed, then!

  7. Perris Calderon

    Perris Calderon Moderator Staff Member Political User

    new york
    this previous post is so not true, qos does not use any of your bandwith