I think you have a very different problem to the OP (oKieran), and probably should be on a different thread, but anyway.
bleep42 wrote:though I started to have problems a few weeks ago.
Did your WiFi work normally until a few weeks ago, when there was a sudden change in performance?
bleep42 wrote: I've already gone down the power route, can't find any problems, but that's not to say there aren't any, difficult to isolate.
A Pi 2 should be able to power a WiFi dongle provided it's power supply is, and it's also not trying to feed a lot of other hungry devices. If the red power LED stays on constantly, and there is no small "rainbow" square on the top right of your monitor, then your power supply is OK.
If you have several USB devices plugged into your Pi, or you are worried that your dongle is not getting enough power from your Pi add the line:
Link Quality=49/70 Signal level=-61 dBm
These figures, from one of your 'iwconfig' postings look low to me. They seem to be taken when you had your RT5370 plugged in. The 8188 driver gives a sightly different format readout. Here's mine, from ifconfig & iwconfig with an Edimax EN7811Un dongle (RTL8188CUS chipset):
Code: Select all
wlan0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:192.168.8.105 Bcast:192.168.8.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:33822 errors:0 dropped:1 overruns:0 frame:0
TX packets:16426 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:12287541 (11.7 MiB) TX bytes:3321923 (3.1 MiB)
pi@raspberrypi ~ $ iwconfig
wlan0 IEEE 802.11bgn ESSID:"HUAWEI-E5372-A218" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:2.437 GHz Access Point: xx:xx:xx:xx:xx:xx
Bit Rate:72.2 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Link Quality=100/100 Signal level=95/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Can you improve your signal by moving things around like your Pi, your WIfI router, other computers or devices that can generate RF interference?
Can you change the channel your WiFi router operates on?
I have noticed that, with the Edimax, once Link Quality starts to drop, performance drops rapidly as well.
bleep42 wrote: it's showing 3 bars of strength, so that's not a problem
WiFi drivers have so many ways of reporting signal strength that I don't trust the GUI's signal bars. Put a few mobile phones beside each other, and they will all disagree about signal strength.
Hope this helps,