Question about limit_traffic_rate module

[slobo42]

Hi,

I just installed a fresh new version of Nginx (v1.8.0) with limit_traffic_rate module.

I am using the module inside a proxy_pass section.
When I am using a wget client on the same server the rate limitation is perfect (2Mbps in my case), but when I am using another application like VLC (I don't know if it is multi-threaded or not) the traffic can jump to 8 Mbps from time to time.

So I am wondering if this could be caused by a bug (chat I don't think) or by the rate limitation computation. Let me explain my thought : sometimes the bitrate can go very low (50Kbps) so if the computation algorithm makes an average over a certain period of time it could let the same IP go very high for a certain period of time so that the global average does not go over the 250Kbps mentioned above.

So my question is : is the limit_traffic_rate is an upper limit in any case or an upper limit over a certain period of time (eg since the connection has been initiated by the end-user) ?

I hope I made it clear.

Anyway thanks for the great job.