On 2011-09-26 6:23 AM, Rajkumar Manoharan wrote:
Recently mac80211 was changed to use nullfunc instead of probe
request for connection monitoring for tx ack status reporting
hardwares. These nullfunc data frames are being sent at higer
rates and also as aggregated ones. This could probably delays
the nullfunc ack so the connection is more frequently getting
disconnected as max retries are reached. In order to improve
the connectivity send the nullfunc at lower rate.
I don't think nullfunc frames should be sent at the lowest rate. If they
fail frequently, then the rate control module is doing something crappy
and should be fixed. So far I haven't seen any nullfunc reliablity
issues with minstrel_ht.
Also, as far as I know, mac80211 sends non-QoS nullfunc frames, so they
cannot get aggregated either.
- Felix
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