On Fri, 4 Aug 2006 10:12:08 -0400, Marc Sims <[EMAIL PROTECTED]> wrote:
>By default Windows XP Packet Scheduler reserves 20% of the bandwidth >for Windows updates and other program updates. This is false. *QoS aware* programs may ask for up to 20% (the so-called default), but this is *only* when that program is active. If no QoS aware program is running, or if no QoS aware program has requested reserved bandwidth, then 0% is actually "reserved". BTW Windows Update does not use QoS, it uses BITS (Background Intelligent Transfer Service). Reserving bandwidth for Windows Update is defeating th e purpose of BITS which tries to *minimize* bandwidth use, and takes advant age of times when the network connection is idle. QoS is to ensure time criti cal programs (such as VoIP) operate correctly in a congested network environm ent. For example, with VoIP, I would leave the default at 20%. That 20% (or lower, it's dynamic) is only used when the QoS aware VoIP app needs it. I f the VoIP app does not need or use the full 20% reserve, the percentage is dynamically adjusted. If the VoIP app is not running, NO bandwidth is res erved. --------------------------------- <http://www.xptuneup.com/tip0025.htm#marker3> "3. Fine tune Internet connection speed: Tip on changing QoS parameter. This tweak deals with QoS parameter manipulation. There have been some confusion as to what can be achieved in real terms by changing the QoS parameter. Microsoft has finally released an article correcting describin g the behavior of QoS parameter. I am providing a link to Microsoft web sit e knowledgebase article <http://support.microsoft.com/directory/article.asp?ID=KB;EN-US;q316666 >. In brief though, this tweak would only work on QoS aware programs and rest o f the programs would simply ignore them. Networking Quality of Service (QoS ) refers to a variety of techniques that prioritize one type of traffic or program when these operate across a network connection rather than relyin g solely on "best effort" connectivity. Please click on how to change QoS parameter article using Group Policy Editor (GPEDIT.MSC).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 progra m 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. This default parameter can be changed. " --------------------------------- -- ---------------------------------------- The WIN-HOME mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html
