Date: Fri, 11 Jan 2013 14:55:47 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Andrew <andrew@ugh.net.au> Cc: freebsd-wireless@freebsd.org Subject: Re: Debugging Stalls with ath(4) Message-ID: <CAJ-VmomAjNKgtu_NHELtmuFZ7DZ1YO2T2_Nz82SDXNfzAC%2BG5A@mail.gmail.com> In-Reply-To: <BC00ED06-760E-44AB-AB35-E2011765EA5C@ugh.net.au> References: <BC00ED06-760E-44AB-AB35-E2011765EA5C@ugh.net.au>
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... oh this is kind of strange. Hm, it's interesting that it's delaying that much; I wonder if the air is really busy and the transmitter just can't squeeze a frame out into the air. How close is it? What's the RSSI? adrian On 8 January 2013 15:50, Andrew <andrew@ugh.net.au> wrote: > Hi, > > I just installed a TP-Link TL-WN851ND PCI wireless card into my 9.1-STABL= E (r244942) box. It shows up in dmesg as Atheros 9287 mac 384.2 RF5133. > > I am running it in hostap mode, 11g. Things seem to work OK but there are= occasionally stalls in traffic across the network. e.g. > > PING 10.0.0.1 (10.0.0.1): 56 data bytes > 64 bytes from 10.0.0.1: icmp_seq=3D0 ttl=3D64 time=3D13.134 ms > 64 bytes from 10.0.0.1: icmp_seq=3D1 ttl=3D64 time=3D77.776 ms > 64 bytes from 10.0.0.1: icmp_seq=3D2 ttl=3D64 time=3D246.675 ms > Request timeout for icmp_seq 3 > 64 bytes from 10.0.0.1: icmp_seq=3D3 ttl=3D64 time=3D1037.327 ms > 64 bytes from 10.0.0.1: icmp_seq=3D4 ttl=3D64 time=3D37.481 ms > > --- 10.0.0.1 ping statistics --- > 5 packets transmitted, 5 packets received, 0.0% packet loss > round-trip min/avg/max/stddev =3D 13.134/282.479/1037.327/386.148 ms > > I was wondering how I would go about debugging the issue? > > I have been playing with wlandebug and I can see that the client I am tes= ting with (though it doesn't appear to be client specific) is listed as goi= ng in and out of PS mode once or twice a second. Not sure that that is a pr= oblem. Using "wlandebug rate" I see: > > Jan 9 00:45:25 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 1600 (1167 bytes) OK rate/try 48 Mb /0/1 > Jan 9 00:45:25 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 1600 (1554 bytes) OK rate/try 48 Mb /0/1 > Jan 9 00:45:25 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 1600 (1554 bytes) OK rate/try 48 Mb /0/1 > Jan 9 00:45:25 sanna kernel: wlan0: [7c:c5:37:6d:4c:7e] ath_rate_tx_comp= lete: size 250 (30 bytes) FAIL rate/try 1 Mb /0/7 > Jan 9 00:45:25 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 250 (106 bytes) OK rate/try 11 Mb /0/1 > Jan 9 00:45:25 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 250 (122 bytes) OK rate/try 11 Mb /0/1 > Jan 9 00:45:26 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 250 (138 bytes) OK rate/try 11 Mb /0/1 > Jan 9 00:45:26 sanna kernel: wlan0: [00:23:14:98:15:b4] ath_rate_findrat= e: size 250 switch rate 48 (1129/690) -> 54 (736/682) after 2 packets mrr 0 > Jan 9 00:45:26 sanna kernel: wlan0: [64:70:02:f0:c8:03] ath_rate_tx_comp= lete: size 250 FAIL rate/try 0/5 no rates yet > Jan 9 00:45:26 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 250 (94 bytes) OK rate/try 11 Mb /0/1 > Jan 9 00:45:26 sanna last message repeated 2 times > Jan 9 00:45:26 sanna kernel: wlan0: [00:23:14:98:15:b4] ath_rate_tx_comp= lete: size 250 (163 bytes) OK rate/try 54 Mb /0/2 > Jan 9 00:45:26 sanna kernel: wlan0: [00:17:f2:e9:04:b0] ath_rate_tx_comp= lete: size 250 (137 bytes) OK rate/try 11 Mb /0/1 > > Given the proximity of the clients and the FreeBSD box I would have expec= ted it to not have had any trouble maintaing a high connection rate - but p= erhaps this is a symptom of the stalls. > > Can anyone suggest where to go from here? > > Thanks, > > Andrew > _______________________________________________ > freebsd-wireless@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-wireless > To unsubscribe, send any mail to "freebsd-wireless-unsubscribe@freebsd.or= g"
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