Now I am testing old PCI cards.
TP-link TL-WN550G (with Atheros AR2413), as the TL-WN851ND ver1.0 I give strange messages:
ath0: bad series0 hwrate 0x1b, tries 1 ts_status 0x0
ath0: ath_rate_tx_complete: ts_rate=27 ts_finaltsi=0, final_rix=0
ath0: bad series0 hwrate 0x1b, tries 1 ts_status 0x0
ath0: ath_rate_tx_complete: ts_rate=27 ts_finaltsi=0, final_rix=0
ath0: bad series0 hwrate 0x1b, tries 1 ts_status 0x0
...
TL-WN550G looks, in spite of it, very stable:
# ping 192.168.0.1
...
--- 192.168.0.1 ping statistics ---
150 packets transmitted, 133 packets received, 11.3% packet loss
round-trip min/avg/max/stddev = 2.324/8.225/128.992/14.394 ms
% ifconfig wlan1 list stat
ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG
:::: 130 11 1M 13.5 0 15537 24464 EPS AQU RSN HTCAP WME WPS
Ookla Speedtest web-site gives:
Download: 3.80 mbps
Upload: 0.25 mbps
Ping: 16 - 93 - 797.
The poor connection does not break, local-unbound does not continuously time-out, and a little WEB browsing is possible.
With other cards (ral) and USB Sticks (run) not even the connection is possible, except for the famous Edimax (rtwn).
Perhaps the reason is the bigger latencies that appear from time to time. This is what Edimax gives:
--- 192.168.0.1 ping statistics ---
101 packets transmitted, 96 packets received, 5.0% packet loss
round-trip min/avg/max/stddev = 4.691/17.102/712.180/71.448 ms
% ifconfig wlan1 list stat
ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG
:::: 130 11 19M 18.5 0 1009 63952 EPS AQHTRstrU RSN HTCAP WME WPS
With the old router I used a run USB stick (RT2860, RF RT2820) many years without any problem, was very stable.
Well, it is clear to me that the problem lies at the side of the router, but the behavior of different devices under this stress wonders me.