Hi Bob and Dennis,
Thanks for your answer.
>On 3/28/2014 8:22 AM, Bob Copeland wrote:
>> Interesting -- I tried this exact thing once before, but got mixed
>> results in my testing.
>>
>> Can you share your testing strategy?
Here is my testing summary :
__ _ |_|_| |_|_| __ _
[__]|=|--->[____°] [____°]<---[__]|=|
/::/|_| /::/|_|
.------------------.
Mesh portal B | Office building | Mesh portal A
Fixed location | 15m x 40m | Fixed location
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
'------------------'
__ _ |_|_|
[__]|=|-->[____°]
/::/|_|
Mesh portal C
Fixed location
All points are mesh portals. Signal levels are :
- around -60dBm between A and B --> metric = 152
- around -60dBm between B and C --> metric = 152
- around -80dBm between A and C --> metric >> 2*152
All point are using openwrt with compat-wireless v2013-04-16.
A runs an iperf server and C an iperf client (see iperf parameters below)
iperf -c mesh_point_A_ip -b10M -i10 -t9999
During the test I monitored both mpath and minstrel stats on mesh portal C:
- mpath (iw wlan0 mpath dump)
- minstrel stats (rc_stats files for stations B and A)
Without my patch, I get 10 or more mpath changes per minute. When I apply it,
the number of changes drops to 1 or 2 per minute. In this particular case, it
seems to be an improvement but I haven't tested this patch in another scenario.
In order to get a fully stable link, I have to set a rssi threshold in order to
prevent C to establish any plink with A (and do the same on point A).
Cédric DEBARGE
ACKSYS R&D dpt.
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