Date: Fri, 9 Sep 2011 14:53:38 +0400 From: Lev Serebryakov <lev@serebryakov.spb.ru> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: AP performance (again): txpower regulation Message-ID: <1853154884.20110909145338@serebryakov.spb.ru> In-Reply-To: <CAJ-VmonfU0iJUiC%2BhT32XvH3t9qwKy98o9GdxMZxqebcSPL04Q@mail.gmail.com> References: <663133681.20110907193747@serebryakov.spb.ru> <CAJ-Vmonai4LzwanLw7i5d-NyjN2b6GqfttjkdcROvOuEcuzEAw@mail.gmail.com> <437702009.20110907235248@serebryakov.spb.ru> <CAJ-Vmo=R-a%2BqhDLWj1n%2BBj70Pmg4WSL6bVZ6jwCUmNq=v7EBBw@mail.gmail.com> <426917282.20110908125907@serebryakov.spb.ru> <CAAUsrB5Qtokpcz-koUfYWCHrsnUUErQSAYHrXrW2F0Uvp3RzSA@mail.gmail.com> <4610390305.20110908154130@serebryakov.spb.ru> <CAAUsrB6LJ%2BmuTvaqHCySh6e9dMjzshohYFE4PQ3KTezZMZS2JA@mail.gmail.com> <1705262661.20110908180850@serebryakov.spb.ru> <CAAUsrB7CFu096x%2BKKWa=8O_VeSHOK10LuwJ2rWq6r8EidUrL=Q@mail.gmail.com> <CAJ-VmokvXfUAZpxDgv5gLrRdLYn3YwTXAOb7QiTyUg8K5yKLHg@mail.gmail.com> <458771414.20110908183656@serebryakov.spb.ru> <CAJ-Vmom_ZHKbqt%2BQgmdq_oPU-SugbrJ3LNS=g-cpcQ7KExusUw@mail.gmail.com> <4910491962.20110908185213@serebryakov.spb.ru> <CAJ-Vmo==J_9ZhnSciVKNaEaMhM4oeM9fr4yjzPev_MW3g9DALg@mail.gmail.com> <1273865639.20110908191303@serebryakov.spb.ru> <CAJ-VmonVEY74qADwXuhHZ-ujc=yjETAhjf%2Bc1oAEkWpPRs0k%2Bw@m ail.gmail.com> <1607911768.20110909113824@serebryakov.spb.ru> <CAJ-VmonfU0iJUiC%2BhT32XvH3t9qwKy98o9GdxMZxqebcSPL04Q@mail.gmail.com>
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Hello, Adrian.
You wrote 9 =D3=C5=CE=D4=D1=C2=D2=D1 2011 =C7., 12:02:46:
> Try forcing the TX/RX antenna then. Look at the output of athstats -
> see how rx antenna isn't balanced?
> I bet half your problem is that half your packets are going in/out of
> a disconnected antenna.
> Antenna profile:
> [1] tx 8543738 rx 4922481
> [2] tx 544837 rx 14216
> See? :)
> Try sysctl dev.ath.0.diversity=3D0
> sysctl dev.ath.0.txantenna=3D1
> sysctl dev.ath.0.rxantenna=3D1
> See if that improves things. If not, try antennas =3D 2.
No luck. I've attached second antenna (exactly the same long
rubberduck 9-10dB model, I have two of them at hands). Result is the
same: "formal" speed is 54M often, but speed is only 4-5Mbit today
(yesterday it was 10Mbit!), I've tried both antennas by one
(diversity=3D0, [tx|rx]antennas=3D[1|2]), results are exactly the same.
Yes, athstats shows, that these sysctls works (counters for disabled
antenna stop), but bandwidth is the same. Here is output of athstats
after almost hour of "iperf", mostly with both antennas turned on
(before experiments with diversity it was only 2400 rx frames on
second antenna and about 200K vs 1M tx frames 1st vs 2nd antennas).
gateway# ./athstats9
958888 data frames received
1583913 data frames transmit
55853 tx frames with an alternate rate
988328 long on-chip tx retries
20281 tx failed 'cuz too many retries
24M current transmit rate
151 tx frames with no ack marked
1556918 tx frames with short preamble
18443 rx failed 'cuz of bad CRC
100 rx failed 'cuz of PHY err
4 OFDM restart
96 CCK restart
32683 beacons transmitted
112 periodic calibrations
-0/+0 TDMA slot adjust (usecs, smoothed)
41 rssi of last ack
36 avg recv rssi
-95 rx noise floor
26844 tx frames through raw api
12 cabq frames transmitted
2 cabq xmit overflowed beacon interval
41 switched default/rx antenna
4 noise immunity level
2 spur immunity level
8 ANI increased noise immunity
6 ANI increased spur immunity
2 ANI decrease spur immunity
4 ANI enabled OFDM weak signal detect
4 ANI disabled CCK weak signal threshold
28509691 cumulative OFDM phy error count
291680 cumulative CCK phy error count
68 ANI forced listen time to zero
988311 missing ACK's
24474 bad FCS
11 average rssi (beacons only)
Antenna profile:
[1] tx 1188167 rx 942337
[2] tx 375448 rx 16551
--=20
// Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>
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