My home Wifi network used to allow me to FTP files to my Android phones at
rates
exceeding 1MB/s, I think that 1.9MB/s was my record. With that sort of speed
transferring a 200MB or 300MB TV show to a phone was reasonably quick.
Performance wasn't always great, sometimes it was as low as 400KB/s, but even
that was usable. In the past I had even watched TV shows on my phone over
HTTP (from a local server) with no performance problems. In the last few days
performance has dropped to below 60KB/s with rates like 40KB/s (that would be
320Kb/s) being common.
Because Android doesn't let me know what's happening I connected my Thinkpad
T420 via Wifi and saw the following result:
# iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:"abcdef"
Mode:Managed Frequency:2.412 GHz Access Point: AA:AA:AA:AA:AA:AA
Bit Rate=1 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=70/70 Signal level=-30 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:286 Invalid misc:11 Missed beacon:0
What's going on here? I ran "iwconfig wlan0 rate auto" which made it briefly
claim a rate of "130 Mb/s" but then it reported 1Mb/s again. 1Mb/s rate for
the Wifi connection would be expected to give something like 40KB/s FTP
transfer speed so it seems that the phones are connecting in the same way as
my laptop.
It says that "abgn" is supported which should give lots of options for rates
higher than 1Mb/s, especially when the quality is 70/70 and the Wifi access
point (a Netgear DGN 2200 ADSL modem) is about 2M away from my laptop with
nothing of note in between.
Any suggestions for what I can do to improve performance?
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
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