[Cerowrt-devel] cerowrt issues (3.10.24-8)

Dave Taht dave.taht at gmail.com
Thu Jan 30 11:21:01 EST 2014

On Wed, Jan 29, 2014 at 11:55 AM, Sebastian Moeller <moeller0 at gmx.de> wrote:
> Hi Steve,
> On Jan 29, 2014, at 19:24 , Steve Jenson <stevej at fruitless.org> wrote:
>> On Wed, Jan 29, 2014 at 9:44 AM, Sebastian Moeller <moeller0 at gmx.de> wrote:
>> On January 29, 2014 5:10:18 PM CET, Dave Taht <dave.taht at gmail.com> wrote:
>> >On Wed, Jan 29, 2014 at 4:45 AM, Sebastian Moeller <moeller0 at gmx.de>
>> >wrote:
>> >> Hi Dave,
>> >>
>> >> quick question, how does one turn of logging for babeld? It seems
>> >that if daemonized it defaults to logging to /var/log/babeld.log (or
>> >similar). Is setting the log file to /dev/null really the answer?
>> >
>> >seems so.
>>       Okay, I guess I will try that then...
>> Here's the directive I'm using in /etc/babeld.conf
>> log-file /dev/null
>> and then you can restart either via the web gui or `/etc/rc.d/S70babeld restart`
>         Ah, thanks. Since I am on 3.10.28-1 this was /etc/init.d/babeld restart. And I opted for putting:
> option 'log-file' '/dev/null'
> into /etc/config/babeld, since that seemed the more openwork way of doing things; I wonder whether it really is wise to carry both files...

I stuck it in /etc/config/babeld.

>         Babeld runs again, and no /var/log/babeld.log appeared, but whether it works I do not know (and I doubt it given that babeld.log was growing due to nasty repeating error messages...)

It's working. It is just not making an optimal routing decision
between AP-managed networks and meshy ones.

The feature is called diversity routing, and it is key to making
wireless networks scale better. There are (now), quite a few papers on
it, but I like Juliusz's best...


Notably this feature is also in batman, but it's called something else
that I forget.

In an example with two radios on a cerowrt AP:

If you have a packet come in from channel 36, it's best that it goes
out via ethernet if possible, channel 11 if not, and not channel 36.
Even if the number of hops seems less, don't go back out 36, if at all
possible, use a different route.

So right now babel is incorrectly distinquishing between the AP
managed SSIDs (sw00, sw10, gw10, gw00),
so the routing decisions there are sub-optimal. As in most cases you
are going to go out ethernet or one of
the more meshy interfaces, or you have no choice but to send stuff
along on one SSID... it's not very sub-optimal.

still, annoying. rule 22 in embedded design is "never write infinitely
long files as the probability of running out of memory or flash always
hits 100%"

> Best Regards
>         Sebastian

Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html

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