[Olsr-dev] 0.5.6-rc7 is out

[Henning Rogge]

On Sun, Jul 13, 2008 at 08:39, John Hay <(spam-protected)> wrote:
> I have tried it plus Henning's fix for etx_ff, with and without the line
> LinkQualityAlgorithm "etx_ff" on a few boxes in our network. FreeBSD+ipv6.
> What I see is that in both cases (with and without etx_ff set) dot_draw
> reports bigger values for the links than the previous olsr that ran on
> them.
The old ETX algorithm (0.5.5) had some bugs that make it's values inconsistent.

"etx_fpm" was changed from rounding down to rounding up in it's fix
point math to allow it to grow to LQ 1.0.
"etx_ff" should be a more stable version of the old 0.5.5 algorithm
without it's bugs.

> It was mostly 0.5.5 or 0.5.4 with the ipv6 patch that went into
> 0.5.5. I do think that either the calculation is not correct or there
> might be some other problem. Maybe it does not like our config. I'll
> add it to the end. At the moment the links are pretty idle and I would
> expect to see values of 1.00 or maybe a little bigger. Two of the boxes
> are connected via 100M ethernet and previously that link would go up
> and down in the 1.x range, now it stays above 2.5. There is no packet
> loss on it and pretty idle, so I think it should be 1.00?
Hmm... you have a "zero packet loss" link between two etx_ff boxes and
it's still not at 1.0 ?
That's strange...

Can you verify the values with the txtinfo plugin please ?

> You can see a pic (updated every 20-30 seconds) at:
>
> http://stats.meraka.csir.co.za/mesh/pta-mesh.html
>
> The boxes that I have updated are: tower1, koppie1, mesh-190b, mesh-190d
> and mesh-21cb. The link between tower1 and koppie1 are the ethernet link.
> (The link colours are green for a link value between 1 and 2, yellow
> from 2 to 5 and red above 5.)
>
> So can it be our config? The idea behind our config was that most of
> the links in the "centre" of our network was pretty good and stable, so
> olsr should not remove routes too easily.


> #############################
> LinkQualityAlgorithm "etx_ff"
> DebugLevel      0
> IpVersion       6
> ClearScreen     yes
> Hna4
> {
> }
> Hna6
> {
> }
> AllowNoInt      yes
> Willingness     7
> IpcConnect
> {
>     MaxConnections  0
>     Host            127.0.0.1
> }

> UseHysteresis   no
> HystScaling     0.50
> HystThrHigh     0.80
> HystThrLow      0.30
You can delete this block

> LinkQualityLevel        2
> LinkQualityWinSize      100
you can delete this one too (not doing anything in the latest olsrd)

> Pollrate        0.05

> TcRedundancy    2
> MprCoverage     7

> LoadPlugin "olsrd_dot_draw.so.0.3"
> {
> }
> Interface "ath0" "ath1" "ath2" "ath3" "npe0"
> {
>    HelloInterval    2.0
>    HelloValidityTime   200.0
>    TcInterval        1.0
>    TcValidityTime      100.0
>    MidInterval 5.0
>    MidValidityTime     15.0
>    HnaInterval 5.0
>    HnaValidityTime     15.0
> }

Hmm... the rest seems to be okay. Please verify the values with the
txtinfo plugin, we had a bug report about the dotdraw plugin.

Henning

-- 
"Wo kämen wir hin, wenn alle sagten, wo kämem wir hin, und niemand
ginge, um einmal zu schauen, wohin man käme, wenn man ginge." (Kurt
Marti)