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

Sven-Ola Tuecke (spam-protected)
Thu May 31 11:51:56 CEST 2007


Right. And there's a big difference between Broadcast and Unicast.

// Sven-Ola

"giuseppe de marco" <(spam-protected)> schrieb im Newsbeitrag 
news:(spam-protected)
> 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.
> G
>
>
> -- 
> 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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