Docs TrafficShaping » History » Revision 12

Revision 11 (metalfoo, 2008-12-11 17:19) → Revision 12/14 (metalfoo, 2012-08-11 10:42)

h1. Traffic Shaping 


 *Module: core* 

 h2. Description 

 Starting with 1.3.8, lighttpd supports limiting the bandwidth for a single connection or config context like a virtual host or a URL. 

 h2. Options 

 Limit the throughput for each single connection to the given limit in kbyte/s 
 Default: 0 (no limit) 

 Limit the throughput for all connections to the given limit in kbyte/s 
 Default: 0 (no limit) 

 If you want to specify a limit for a special virtual server use: 


     $HTTP["host"] == "" { 
       server.kbytes-per-second = 128 


 which will override the default for this host. 


 Keep in mind that a limit below 32kb/s might actually limit the traffic to 32kb/s.  
 This is caused by the size of the TCP send buffer. 

 h2. Selective traffic shaping plugin(>=1.5-svn) 

 There is a small plugin to use selective traffic shaping on a per-connection base. You can e.g. use php and do: 


  header("X-LIGHTTPD-KBytes-per-second: 50"); 
  header("X-Sendfile: /path/to/file"); 


 to set the speed of the current connection. 

 h2. Plugin options 

 *speed.just-copy-header = "enable"* 
 Use this on the frontend to just copy the header from the response to the request header (forward it to the backend) 
 Default: "disabled" (just use it) 

 *speed.use-request = "enable"* 
 Use this on the backend to fetch the speed from the request. This is not useful on the frontend, i think :)  
 Default: "disabled" (don't look in the request headers) 

 h3. Build it 

 See the attached file for the most recent version of mod_speed. To build it, download a recent version of Lighttpd 1.5 (from SVN or official pre-release), place this file in the @src@ directory and add it the following lines to your 

 mod_speed_la_SOURCES = mod_speed.c 
 mod_speed_la_LDFLAGS = -module -export-dynamic -avoid-version -no-undefined 
 mod_speed_la_LIBADD = $(common_libadd)