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

[Henning Rogge]

At the moment you can mix everything except etxff_eth... because this
one NEEDS a special encoding, which cannot be expressed in the old
format.

Henning Rogge

On Wed, Jan 2, 2013 at 1:28 PM, Saverio Proto <(spam-protected)> wrote:
> Hello,
>
> I wanted to give feedback about this.
>
> We are happy now using etx_float on those nodes where a strong (0.3)
> LinkQualityMult is applied. Links do not flap anymore. We are also
> using the LinkQualityAging at 0.02.
>
> thanks for support.
>
> Saverio
>
>
>
> 2012/12/12 Ferry Huberts <(spam-protected)>:
>> 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 algorithms.
>>
>> 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



-- 
Steven Hawkings about cosmic inflation: "An increase of billions of
billions of percent in a tiny fraction of a second. Of course, that
was before the present government."