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ath9k rate control statistics not updated for UDP

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I am using iperf to test rate control algorithms (use default:minstrel_ht) on an
ath9k device (WRT160NL OpenWRT Backfire 10.3.1 r29592). 
When I use UDP traffic over an 802.11g connection, the rcstat file is not
updated. Not sure if the rate control algoritmh works during the process.
If I use TCP traffic, rcstat is updated and statistics/rate change accordingly.

Is this the correct behaviour of minstrel RC? I went through documentation
regarding MRR and retransmission bounds but wasn't able to figure it out. Any
one noticed something similar?

Thanks in advance,
Antonis

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