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# MadWifi configuration
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config MADWIFI_DEBUG
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bool "Enable compilation of debugging features"
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depends on EXPERIMENTAL && PACKAGE_kmod-madwifi
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default n
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choice
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prompt "Rate control algorithm selection"
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depends on PACKAGE_kmod-madwifi
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default MADWIFI_RCA_MINSTREL
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help
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This option controls how MadWifi chooses its bitrate.
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config MADWIFI_RCA_MINSTREL
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bool "Use the Minstrel rate control algorithm"
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help
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This code is takes a wandering minstrel approach. Wander around the
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different rates, singing wherever you can. And then, look at the
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performance, and make a choice. Note that the wandering minstrel will
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always wander in directions where he/she feels he/she will get paid
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the best for his/her work.
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config MADWIFI_RCA_ONOE
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bool "Use the Onoe rate control algorithm"
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help
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Onoe is a credit based RCA where the value of the credit is determined
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by the frequency of successful, erroneous and retransmissions
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accumulated during a fixed invocation period of 1000 ms. If less than
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10% of the packets need to be retransmitted at a particular rate, Onoe
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keeps increasing its credit point till the threshold value of 10 is
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reached. At this point, the current transmission rate is increased to
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the next available higher rate and the process repeated with credit
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score of zero. Similar logic holds for deducting the credit score and
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moving to a lower bit-rate for failed packet
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transmission/retransmission attempts. However, once a bit-rate has
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been marked as failure in the previous attempt, Onoe will not attempt
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to select that bit-rate until 10 seconds have elapsed since the last
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attempt. Due to the manner in which it operates, Onoe is conservative
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in rate selection and is less sensitive to individual packet failure.
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config MADWIFI_RCA_AMRR
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bool "Use the AMRR rate control algorithm"
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help
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AMRR uses Binary Exponential Backoff (BEB) technique to adapt the
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length (threshold) of the sampling period used to change the values of
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bit-rate and transmission count parameters. It uses probe packets and
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depending on their transmission status adaptively changes the threshold
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value. The adaptation mechanism ensures fewer failed
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transmission/retransmission and higher throughput by not switching to a
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higher rate as specified by the backoff mechanism. In addition to this,
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the AMRR employs heuristics to capture the short-term variations of the
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channel by judiciously setting the rate and transmission count
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parameters.
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config MADWIFI_RCA_SAMPLERATE
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bool "Use the SampleRate rate control algorithm"
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help
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SampleRate decides on the transmission bit-rate based on the past
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history of performance; it keeps a record of the number of successive
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failures, the number of successful transmits and the total transmission
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time along with the destination for that bit-rate. Stale samples are
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removed based on a EWMA windowing mechanism. If in the sampling
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process, no successful acknowledgment is received or the number of
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packets sent is multiple of 10 on a specific link, it transmits the
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packet with the highest rate which has not failed 4 successive times.
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Other than that it transmits packets at the rate which has the lowest
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average transmission time.
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endchoice
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