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minstrel falls down to 1Mbit rate

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Hello,

we try to compile an openwrt image for the linksys wrt54gl router. these
routers will build a mesh network and use ad-hoc-mode and olsr.

from time to time the routers will fall down to the one and only rate we
set as mcast rate), as 
"cat /sys/kernel/debug/ieee80211/phy0/netdev
\:wlan0/stations/*/rc_stats" 
tells us.

the result will look like this (in our environment mcast rate is set to
1):

rate     throughput  ewma prob   this prob  this succ/attempt   success
attempts
TtP  1         0.1       15.6        0.0          0(  0)         12
27

the only ways to correct this is to reboot the router or restart the
wifi components.

the period of time this occurs, varies from 2 minutes to some days.

Are there any suggestions how to avoid this issues?

Best,

Andreas 

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