Hi,
for several years now, I've been running an ALIX-AP with a CM9 Atheros
5212 card. The AP covers a whole house which has about 6 flats and the
average amount of active clients ranges from 10 to 15.
Recently I noticed high latency when pinging the AP itself which happens
when distant clients (who knows where around the house---could be inside
or outside) seem to cause "longs" (long on-chip tx retries) and/or
"xretries" (tx failed 'cuz too many retries).
The Rate, when talking to these distant clients, is usually below 11M
(sometimes as low as 1M) which is consistent with their low RSSI values
the AP is reporting.
With high latency I mean continuous bursts of 500-1000ms instead of
0.5ms so I wonder if this is normal.
The software is slightly out of date and athstats is not completely in
sync with the kernel i'm using (therefore its not reporting some values):
# uname -a
FreeBSD parrot.NGC004 8.1-RC2 FreeBSD 8.1-RC2 #2: Thu Aug 16 21:13:54
CEST 2012
# athstats -i ath0
athstats: ath0: Invalid argument
athstats: ath0: Invalid argument
3181606 data frames transmit
45659 tx frames with an alternate rate
568149 long on-chip tx retries
19091 tx failed 'cuz too many retries
0M current transmit rate
25 tx stopped 'cuz no xmit buffer
20922 tx frames with no ack marked
3039151 tx frames with short preamble
362335 rx failed 'cuz of bad CRC
1181 rx failed 'cuz of PHY err
315 OFDM restart
866 CCK restart
2 TDMA slot timing updates
-0/+0 TDMA slot adjust (usecs, smoothed)
26135 TDMA tx failed 'cuz ACK required
-74 rx noise floor
3070927 tx frames through raw api
6299685 fast frames received
1328215 fast frames flushed from staging q
20835 ANI decrease noise immunity
6593 ANI increased spur immunity
121582 ANI decrease spur immunity
160 ANI decreased first step level
2 cumulative OFDM phy error count
2 RTS without CTS
1360093 beacons received
Antenna profile:
Any ideas on how to avoid that? Of course I could buy better antennas
but it seems that, generally speaking, this shouldn't happen.
Thanks,
Petar Bogdanovic
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