[Olsr-dev] [PATCH v1 0/3] Use bandwidth during gateway selection

[Ferry Huberts]

On 27-07-12 13:59, Daniel Nitzpon wrote:
> Hi!
>
> Am 27.07.2012 13:21, schrieb Teco Boot:
>> I also want to see comments. Maybe also:
>>   - not interest in SmartGW at all
>>   - interested, but not tried yet
>
>>
>> Op 27 jul. 2012, om 12:50 heeft Henning Rogge het volgende geschreven:
>>
>>> I would like to hear some comments about this from someone who has
>>> USED the SmartGW system.
>
> Haven't used it yet, sorry..
> But still a comment:
>
>>> On 07/26/2012 04:23 PM, Ferry Huberts wrote:
>>>> - We calculate a new path cost of
>>>>
>>>>      new_path_cost = (1 / (uplink + downlink)) + (tc_path_cost / 4)
>>>>
>>>>    (uplink and downlink in Mbps)
>>>>    (the 1 and 4 are weighing factors and we can make then configurable)
>
> Freifunk experience here tells that in shared gateways via ADSL the
> uplink is usually a much more limiting factor than the downlink. So I
> would propose something along the lines of
>
> new_path_cost = (1 / 2*(min (uplink*4, downlink))) + (tc_path_cost / 4)
>
> (without having a real opinion on the weighting factors, just introduced
> 1/2 to preserve the magnitude of the original suggestion)
>

Interesting point.
I did think about this a few days ago, but wanted to propose the simple 
scenario first ;-)

How about scaling the combined bandwidth back with an asymmetry factor, 
something like:


asym = (uplink > downlink) ? (downlink/uplink) : (uplink/downlink)
new_path_cost = (1 / (asym * (uplink + downlink))) + (tc_path_cost / 4)

> Daniel
>

-- 
Ferry Huberts