[B.A.T.M.A.N.] [batman-adv] one edge case with 40+ neighbors

[B.A.T.M.A.N.] [batman-adv] one edge case with 40+ neighbors

[Xuebing Wang]

Hi Simon, Sven,

Thanks for your excellent help. We have 50+ sites (and a total of 1000+ 
nodes running in the field) for over a month, and batman-adv works 
perfectly, maybe I wasn't notified, but I did not hear a single failure.

We have an edge case:
Our nodes are relatively closely placed, which results in 40+ neighbors 
for each node. And batman-adv seemingly does not work for this edge 
case. The issue may be that with this many 40+ neighbors, and neighbors' 
neighbors, ... it is complicated to calculate the route, is this the 
possible cause?

The resolution I can think of is that we can choose the best 12 or so 
(configurable) neighbors (based on signal strength). Is this choosing 
configurable 12 or so best neighbors the best approach? I can try to 
make the change, and upstream for your code-review / merge.

Thanks again.

Xuebing Wang

Re: [B.A.T.M.A.N.] [batman-adv] one edge case with 40+ neighbors

[Sven Eckelmann]

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On Freitag, 2. Juni 2017 14:57:18 CEST Xuebing Wang wrote:
>  And batman-adv seemingly does not work for this edge

Please define "does not work" in your setup.

Kind regards,
	Sven

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Re: [B.A.T.M.A.N.] [batman-adv] one edge case with 40+ neighbors

[Xuebing Wang]

Hi Sven,

Thanks for asking this. It is my fault that I did not ask our QA and 
tell the community the details.

The syndrome is that there are randomly nodes that can not ping other 
nodes, it happens quite often within a day. As I changed ath_dbg() to 
ath_warn() to print messages before ath9k_queue_reset() in our release, 
we get "tx hung, resetting the chip" in dmesg (for RESET_TYPE_TX_HANG).
-- I am using software encryption.

This seems pointing to that ath9k driver can not handle 40 connections 
for IBSS/adhoc? Based on our test, 20 connections for ath9k IBSS/adhoc 
are definitely ok.

Thanks.
Xuebing Wang


On 2017年06月02日 15:04, Sven Eckelmann wrote:
> On Freitag, 2. Juni 2017 14:57:18 CEST Xuebing Wang wrote:
>>   And batman-adv seemingly does not work for this edge
> Please define "does not work" in your setup.
>
> Kind regards,
> 	Sven