Date: Mon, 21 May 2012 14:58:06 +0200 From: Johann Hugo <jhugo@meraka.csir.co.za> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: [ath] Degraded throughput - adhoc mode Message-ID: <201205211458.06399.jhugo@meraka.csir.co.za> In-Reply-To: <CAJ-VmonkOozTeC2sGwx5DP76fsxk-SOwe0RuFeNXr2jfw5zZ6g@mail.gmail.com> References: <201205181133.57403.jhugo@meraka.csir.co.za> <CAJ-VmonkOozTeC2sGwx5DP76fsxk-SOwe0RuFeNXr2jfw5zZ6g@mail.gmail.com>
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On Friday 18 May 2012 19:23:51 Adrian Chadd wrote:
> Hi,
>
> Please check the output of the sample rate module - sysctl
> dev.ath.X.sample_stats=1, then check dmesg.
elardus:~ # sysctl dev.ath.2.sample_stats=1
dev.ath.2.sample_stats: 0 -> 0
elardus:~ # dmesg
[00:21:a4:32:06:32] refcnt 4 static_rix 0 ratemask 0x0
[ 250] cur rix 0 (1 Mb ) since switch: packets 0 ticks 0
[ 250] last sample 0 cur sample 0 packets sent 0
[ 250] packets since sample 0 sample tt 0
[1600] cur rix 0 (1 Mb ) since switch: packets 0 ticks 0
[1600] last sample 0 cur sample 0 packets sent 0
[1600] packets since sample 0 sample tt 0
[00:21:a4:32:06:3c] refcnt 3 static_rix -1 ratemask 0xfcf
[ 250] cur rix 7 (18 Mb ) since switch: packets 1 ticks 25922949
[ 250] last sample 9 cur sample -1 packets sent 674099
[ 250] packets since sample 6 sample tt 464
[1600] cur rix 9 (36 Mb ) since switch: packets 1 ticks 25919954
[1600] last sample 10 cur sample -1 packets sent 11017718
[1600] packets since sample 4 sample tt 672
[ 1 Mb : 250] 31:20 ( 64%) T 57 F 0 avg 4938 last
6625934
[ 1 Mb :1600] 123:98 ( 79%) T 198 F 0 avg 16723 last 203098
[ 2 Mb : 250] 2:2 (100%) T 2 F 0 avg 2064 last
8563311
[ 2 Mb :1600] 1:1 (100%) T 2 F 0 avg 15538 last
17316442
[ 5 Mb : 250] 59:58 ( 98%) T 96 F 0 avg 4528 last
4722129
[ 5 Mb :1600] 21:20 ( 95%) T 38 F 1 avg 6506 last
8563314
[11 Mb : 250] 81:78 ( 96%) T 179 F 0 avg 4128 last 93962
[11 Mb :1600] 355:341 ( 96%) T 547 F 0 avg 4633 last 82599
[12 Mb : 250] 16399:16353 ( 99%) T 18240 F 0 avg 1359 last 82047
[12 Mb :1600] 10027:9892 ( 98%) T 13312 F 0 avg 1513 last 19942
[18 Mb : 250] 51489:51386 ( 99%) T 56048 F 0 avg 578 last 1906
[18 Mb :1600] 57151:56687 ( 99%) T 69074 F 0 avg 1605 last 19904
[24 Mb : 250] 103198:103008 ( 99%) T 110475 F 0 avg 947 last 4447
[24 Mb :1600] 254328:252988 ( 99%) T 298502 F 0 avg 988 last 18101
[36 Mb : 250] 163897:163690 ( 99%) T 171966 F 0 avg 877 last 3967
[36 Mb :1600] 1429440:1426539 ( 99%) T 1536544 F 0 avg 942 last 4910
[48 Mb : 250] 195032:194854 ( 99%) T 204404 F 1 avg 1844 last 82317
[48 Mb :1600] 5528565:5524701 ( 99%) T 5986172 F 0 avg 1194 last 16940
[54 Mb : 250] 145001:144812 ( 99%) T 152999 F 2 avg 1614 last 203418
[54 Mb :1600] 3751938:3747594 ( 99%) T 4223608 F 6 avg 3436 last 203110
>
> Which NICs are you using?
dev.ath.2.%desc: Atheros 5413
sysctl with big counters:
dev.ath.2.stats.rx_phy_err.31: 82410
dev.ath.2.stats.ast_rx_crcerr: 812069
dev.ath.2.stats.ast_rx_phyerr: 82480
dev.ath.2.stats.ast_tx_shortpre: 11694060
dev.ath.2.stats.ast_tx_qstop: 1514731
dev.ath.2.stats.ast_tx_longretry: 1151533
dev.ath.2.stats.ast_tx_raw: 15228
Another interesting thing is a rhythmic pattern for ping delays
(ifconfig down/up fixes it)
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=180 hlim=64
time=2.963 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=181 hlim=64
time=14.267 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=182 hlim=64
time=26.009 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=183 hlim=64
time=49.559 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=184 hlim=64
time=1.763 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=185 hlim=64
time=3.170 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=186 hlim=64
time=81.034 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=187 hlim=64
time=42.084 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=188 hlim=64
time=65.945 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=189 hlim=64
time=1.710 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=190 hlim=64
time=10.702 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=191 hlim=64
time=35.973 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=192 hlim=64
time=59.943 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=193 hlim=64
time=82.535 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=194 hlim=64
time=3.309 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=195 hlim=64
time=27.272 ms
16 bytes from fd9c:6829:597c:20:221:a4ff:fe32:63c, icmp_seq=196 hlim=64
time=51.926 ms
Johann
>
>
>
> Adrian
>
> On 18 May 2012 02:33, Johann Hugo <jhugo@meraka.csir.co.za> wrote:
> > Hi
> >
> > We have an outdoor wifi mesh network with various atheros adapters
> > configured in adhoc mode. (FreeBSD-9)
> >
> > We sometimes (randomly) get a wifi adapter that goes into a "slow-mo"
> > mode, with degraded throughput, less than half.
> >
> > A simple ifconfig wlanX down/up fixes the problem.
> >
> > Before: (slow-mo)
> > [jhugo@jeep] ~> scp /boot/kernel/kernel zeus.cids.org.za:/dev/null
> > kernel 100% 15MB 445.7KB/s 00:34
> >
> > After:
> > [jhugo@jeep] ~> scp /boot/kernel/kernel coin@elardus:/dev/null
> > kernel 100% 15MB 1.0MB/s 00:15
> >
> > Here is a list of all the registers (athregs) that changed during the
> > down/up.
> >
> > Register Before After
> > RXDP 01200ea0 01200840
> > MIBC 00000001 00000000
> > SPC_0 00942a83 000c246a
> > DMADBG0 88888898 88888888
> > DMADBG4 000000a0 00000000
> > DMADBG5 04000000 00000000
> > DMADBG6 00032000 00022000
> > DMADBG7 000140a0 00000000
> > D_SEQ 0000038a 000008c1
> > TIMER0 000071d8 00000064
> > TIMER1 00038eb0 00000310
> > TIMER2 01bb8c30 000002d0
> > TIMER3 000071b5 00000065
> > TSF_L32 ddc5e966 de252332
> > DEF_ANT 00000000 00000001
> > OBSERV1 00002898 00002888
> > LAST_TST ddc52219 de2473af
> > ACK_FAIL 00000002 00000000
> > FCS_FAIL 00000000 00000001
> > TFCNT 0d8e4e2f 01e95fea
> > RFCNT 157c4d09 015d5432
> > RCCNT 281c998e 03b5a65c
> > CCCNT d4782107 0d5b4b5b
> > QUIET1 0000717c 00000088
> > FILTOFDM 00ffffff 000001b8
> > FILTCCK 00ffffff 0000015e
> > PHYCNT1 00bffe72 00bffe9f
> > PHYCNT2 00bfff3f 00bfff4a
> >
> > Is there a wiki/docs on the web that explains what these registers mean ?
> > The only thing I could find was this link.
> > http://madwifi-project.org/wiki/DevDocs/AtherosRegisters
> >
> > Any other usefull info that I should capture the next time this happens ?
> >
> > Regards
> > Johann
> > _______________________________________________
> > freebsd-wireless@freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-wireless
> > To unsubscribe, send any mail to
> > "freebsd-wireless-unsubscribe@freebsd.org"
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