Have been tested with 4 usb wifi adaptor, all loss packet when ping to router

[valdis.kletnieks at vt.edu]

On Sat, 01 Apr 2017 02:14:18 +0800, Hao Zhang said:
> hi all,
> i use usb wifi dongle rt5370/rt3070/rtl8192cus/rtl8178 on embeded
> board based kernel 3.10.0 , they all loss packet when ping to router,
> and then ifconfig can show below that
> it seem some packet were been dropped, What does that dropped means?

>           RX packets:235 errors:0 dropped:4 overruns:0 frame:0

On wireless, the most likely cause is RF noise causing a mangled packet
that gets dropped due to CRC checks and the like.  4 dropped packets isn't
time to start worrying - network protocols are supposed to retransmit
if it becomes clear that a packet was lost.

If the packet loss is high enough that it actually impacts throughput, your
best bet is to move the base station to a different wireless channel. If you're
using a 2.4Gz device, moving to 5Ghz (if possible) may help a lot, as the 2.4
band is full of microwave ovens and other sources of RF noise.

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