[Olsr-dev] [Olsr-users] Question: is possible to use mixed LinkQualityAlgorithm among nodes ?

Ferry Huberts (spam-protected)
Wed Dec 12 23:03:14 CET 2012

One note though:

ffeth and ffeth_nl80211 store their values in a different location in 
the 'wireformat' so using that is not compatible with the other lq 

I have a branch that fixes that for ffeth (but not for ffeth_nl80211 
since that plugin is experimental), but have not published it (yet) 
because it's a breaking change.

If you want I can publish it though.

On 12/12/12 22:52, Henning Rogge wrote:
> On Wed, Dec 12, 2012 at 7:31 PM, Saverio Proto <(spam-protected)> wrote:
>> Short version:
>> Question: is possible to use mixed LinkQualityAlgorithm among nodes ?
>> If I have most nodes with "etx_ff" and some other nodes running
>> "etx_float" I will run into trouble ?
> No... you only get in trouble if you use "etx_ffeth".
>> Long version:
>> In Ninux we have some links that are very long, like 20Km. These links
>> have very low bandwidth, around 1Mbps, but also very low packet loss,
>> so that when there is no user traffic the ETX is 1, and all the
>> traffic prefers these links.
>> We use then LinkQualityMult to raise the ETX to 10. Raising so much
>> causes the link to flap, because with little traffic is very easy to
>> have a small packet loss and the cost will reach LINK_COST_BROKEN.
> Try to raise the link quality multiplier to 3 on both sides... that
> should give you an ETX of 9 without instant link breaking.
>> I want to try to tune LinkQualityAging that now is set at the default
>> value to see if I can avoid this flapping, and I want also to try the
>> etx_float algorithm to see if I can solve this problem.
> lqaging doesn't work in etxff and etxff_eth.
> It will not help with links with lqmult 10, because lq<0.1 is
> considered a "broken" link I think.
> Henning Rogge

Ferry Huberts

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