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

[Varnish]

#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
-------------------------+--------------------------------------------------
 Hi,

 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$" ) {
                 std.set_bandwidth(20000);
         }
 }
 }}}


 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
 networks.

 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.


 Thanks,


 Thierry

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