[FS#929] mt7620 abysmal wifi performance

[LEDE Bugs]

The following task has a new comment added:

FS#929 - mt7620 abysmal wifi performance
User who did this - pmgp (mgondium)

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@psyborg55

tested just now

17.01.1: ~82/~78 Mbps dl/ul
your image: ~56 /~52 Mbps dl/ul

no errors on log and changing channels doesn't mess up like trunk
still, performance is lower

wireless configuration:
config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11g'
        option path 'platform/10180000.wmac'
        option disabled '0'
        option channel '1'
        option htmode 'HT40'
        option txpower '20'
        option country 'US'
        option noscan '1'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid ''
        option hidden '1'
        option encryption 'psk2+ccmp'
        option key ''

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=929#comment3162