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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/networking/shaper.txt
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+Traffic Shaper For Linux
+
+This is the current BETA release of the traffic shaper for Linux. It works
+within the following limits:
+
+o Minimum shaping speed is currently about 9600 baud (it can only
+shape down to 1 byte per clock tick)
+
+o Maximum is about 256K, it will go above this but get a bit blocky.
+
+o If you ifconfig the master device that a shaper is attached to down
+then your machine will follow.
+
+o The shaper must be a module.
+
+
+Setup:
+
+ A shaper device is configured using the shapeconfig program.
+Typically you will do something like this
+
+shapecfg attach shaper0 eth1
+shapecfg speed shaper0 64000
+ifconfig shaper0 myhost netmask 255.255.255.240 broadcast 1.2.3.4.255 up
+route add -net some.network netmask a.b.c.d dev shaper0
+
+The shaper should have the same IP address as the device it is attached to
+for normal use.
+
+Gotchas:
+
+ The shaper shapes transmitted traffic. It's rather impossible to
+shape received traffic except at the end (or a router) transmitting it.
+
+ Gated/routed/rwhod/mrouted all see the shaper as an additional device
+and will treat it as such unless patched. Note that for mrouted you can run
+mrouted tunnels via a traffic shaper to control bandwidth usage.
+
+ The shaper is device/route based. This makes it very easy to use
+with any setup BUT less flexible. You may need to use iproute2 to set up
+multiple route tables to get the flexibility.
+
+ There is no "borrowing" or "sharing" scheme. This is a simple
+traffic limiter. We implement Van Jacobson and Sally Floyd's CBQ
+architecture into Linux 2.2. This is the preferred solution. Shaper is
+for simple or back compatible setups.
+
+Alan