[Commotion-discuss] HIgh volume performance

Adam Longwill adam.longwill at gmail.com
Fri Mar 20 13:02:49 EDT 2015


Agreed with Mr. West.

On Fri, Mar 20, 2015 at 1:00 PM, Ben West <ben at gowasabi.net> wrote:

> Echoing Adam's recommendation to distribute the load of 100+ clients over
> multiple nodes set to non-overlapping channels, with each node wired back
> to whatever gateway device with cat-5 lines.  That is, don't bother with
> wireless meshing if you can avoid it.  A single 802.11 channel won't
> sustain that many clients, much less the meshing OLSR traffic.  So, say 10
> nodes spaced evenly throughout the conference venue, where immediately
> adjacent nodes are set to furthest possible channels (e.g channel 1 and
> 11).  Apply similar reasoning for dual-band access points; adjacent devices
> need to not have their radios on adjacent frequencies.
>
> Also, you probably will want to turn the TX power on each node *down as
> much as possible*, as they will be operating in a very noisy environment
> at close spacing.  RX sensitivity is preferred over trying to drown out
> noise with TX power.
>
> Finally, you'd want generous RAM available on the access points, so that
> the firmware can service many clients.  Something like UBNT Rocket M2 (64MB
> RAM), UBNT UniFi AP (64MB RAM), or even TP-Link TL-WDR4300 (128MB).  The
> UBNT stuff would permit easier mounting on walls/poles, since the TP-Link
> is only an indoor consumer-grade unit.
>
>
>
>
> On Fri, Mar 20, 2015 at 10:32 AM, Adam Longwill <adam.longwill at gmail.com>
> wrote:
>
>> There will be issues with any device accepting more than 35 connection
>> requests at a time due to the nature on 802.11 in general. You're going to
>> have plenty of congestion with more than that and probably have hidden node
>> problem issues without RTS/ CTS in that situation.
>>
>> Commotion is is OpenWRT with some configurations and OLSR running on the
>> mesh interface which will reduce airtime overall. If anything, you should
>> mitigate this by having multiple radios on multiple channels with ethernet
>> meshing instead of a wireless mesh interface.
>> On 20 Mar 2015 11:11, "David Banks" <david.adam.banks at gmail.com> wrote:
>>
>>> Hello Everyone,
>>>
>>> Has anyone  had experience using routers running commotion in high
>>> volume, single building settings? I'm organizing a conference set for next
>>> month and thought this would be an interesting application. Anyone know of
>>> good commotion-compatible hardware that's capable of accepting 100+
>>> connection requests at a time?
>>>
>>> --
>>> -db
>>>
>>> _______________________________________________
>>> Commotion-discuss mailing list
>>> Commotion-discuss at lists.chambana.net
>>> https://lists.chambana.net/mailman/listinfo/commotion-discuss
>>>
>>>
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>>
>
>
> --
> Ben West
> http://gowasabi.net
> ben at gowasabi.net
> 314-246-9434
>
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