[Varnish] #792: Bandwidth management / rate-limiting

Varnish varnish-bugs at varnish-cache.org
Thu Oct 7 11:21:32 CEST 2010

#792: Bandwidth management / rate-limiting
 Reporter:  tmagnien     |       Owner:  phk                 
     Type:  enhancement  |      Status:  new                 
 Priority:  normal       |   Milestone:                      
Component:  varnishd     |     Version:  trunk               
 Severity:  normal       |    Keywords:  bandwidth rate-limit

 Here is a patch to allow for rate-limiting on specific objects / url /
 etc. It uses vmod and looks like this in the VCL :

 sub vcl_recv {
         if ( req.url ~ "^/bigone.ts$" ) {

 This will limit the delivery at 20000 bytes/sec.

 The idea behind this (eh, who would like to slow down delivery with a web-
 accelerator ?) is the following : mobile users watching a video usually
 watch the first N seconds and stop. But as they start watching, the device
 downloads at full speed in order to fill up its cache. The result is that
 a lot of downloaded data are never used, so why wouldn't we limit the
 download rate to the rate at which the video is encoded ? This allows to
 decrease the overall data transfer, which is not a bad idea on mobile

 Note that this is just a "testcase" patch : the "sleep(1)" would better be
 something more precise but that's the main idea.

 All remarks welcome.



Ticket URL: <http://varnish-cache.org/trac/ticket/792>
Varnish <http://varnish-cache.org/>
The Varnish HTTP Accelerator

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