[Olsr-dev] link quality vs. application packet loss

giuseppe de marco (spam-protected)
Thu May 31 02:24:36 CEST 2007

Victor lyamtsev wrote:
> Hi,
> I tried to compare packet loss reported by OLSR demon ( Linux ) and 
> "iperf'" I am running between 2 wireless ad-hoc nodes
> and I wonder why I don't see clear correlation... OLSR reports  ILQ = 
> 0.3 ( 70 % packet loss ??) for "transmitter"  node  when  I don't  
> stream any data. What makes this packet loss percentage so high?  Can 
> someone advise me on what I can manipulate to change the number? 
> I tried to send  enough UDP packets to "congest" the channel enough to 
> cause 70-80% packet loss in  "iperf". The ILQ number can fluctuate up 
> and down for breif moments but on average stays the same. Should't 
> "Hello" packet loss change on the congested link? Is there any 
> difference on how "Hello" traffic is treated from application traffic, 
> e.g. does it have higher routing priority?
> Thank you,
> -v
Because OLSR compute the p.loss on HELLO messages basis and not on 
application data losses.

Giuseppe De Marco, phD
Toyota Technological Institute
468-8511 Aichi 2-12-1 Hisakata, Tenpaku-ku, 
Nagoya, Japan
Email: demarco at toyota-ti dot ac dot jp
Tel (int): +81 (052)-809-1802
Skype-Id: giuseppe_dem2

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