[OLSR-users] LQ Routing and 802.11b Link Speed

[Andrew Hodel]

In my experience, LQ is not stable.  Anything that uses a stream fails
withing a few minutes over a 2+ hop link (even ssh).  I have tried
different settings and still nothing.  I am going to switch the entire
network to hysteresis and work with that next.  If I still get
nothing, I will try IP6.



Andrew


On 6/15/05, Holger Mauermann <(spam-protected)> wrote:
> Holger Mauermann wrote:
> > What about measuring not only the packet loss, but also the round
> > trip time to the neighbors?
> 
> Forget my last post. The RTT depends on the link load and leads to very
> frequent route changes...
> 
> However, recently I read something about Packet-Pair based bandwidth
> estimation and Expected Transmission Time (ETT) and it looks very
> interesting. Consider the following real life example with 3 links:
> 
> A-B: 24 Mbps, ETX 1.0
> A-C:  1 Mbps, ETX 1.5
> B-C: 11 Mbps, ETX 1.0
> 
> To reach C from A olsr currenty prefers the short, bad 1 Mbps link. With
> ETT it could use the two fast links A-B and B-C because the total ETT is
> only 2.5 ms instead of 15 ms:
> 
> ETT = ETX * S / B       S = Packet size, B = Bandwidth
> 
> A-B: ETT 0.8 ms (S = 1 KByte, B = 1200 kByte/s)
> A-C: ETT  15 ms (S = 1 KByte, B =  100 kByte/s)
> B-C: ETT 1.7 ms (S = 1 KByte, B =  600 kByte/s)
> 
> Any ideas if this could be implemented in olsr?
> 
> --
> \-- Holger Mauermann
>   \-- (spam-protected)
>    \-- PGP Key Id: 0x8EA8C301
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