On Saturday, 15 October 2005, at 20:29:20 +0200, Jorge Sanchez wrote: > Any router performing a shaping function should be the bottleneck on the > link, and should be shaping slightly below the maximum available link > bandwidth. This prevents queues from forming in other routers, affording > maximum control of packet latency/deferral to the shaping device. > In the Internet, traffic flows through a number of router between source and destination, routers you can not control. In the router closest to your network (if using ADSL, the local telephone witching central with DSLAM adapters) sometimes the ISP or telco applies buffering to each subscriber. That is, to get tranfer rates up it is very easy to allocate and indeterminate (but usually large) buffer for incoming traffic. This way, when you download at full speed you get, well, full speed, but the telco is getting more data at a rate greater than you can, so it buffers traffic in excess. So, if the sending box somewhat slows down (network congestion), your telco still has data to send and keep your line 100% full. So statistics show you get a fantastic service bandwitdh wise, but not so good with respect to latency. The only way to prevent those buffer to even start filling is shaping traffic to/from your network some Kbps bellow your nominal maximun transfer rate. You have to "be" the bottelneck to be able to control bandwidth allocation and keep latency to a minumun. Hope I made an understandable explanation. Greetings, -- Jose Luis Domingo Lopez Linux Registered User #189436 Debian Linux Sid (Linux 2.6.14-rc3-git7)
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