Am 20.07.2016 um 13:03 schrieb Michal Kazior:
On 20 July 2016 at 12:50, Sebastian Gottschall
<[email protected]> wrote:
Am 20.07.2016 um 12:23 schrieb Michal Kazior:
On 20 July 2016 at 10:51, Sebastian Gottschall
<[email protected]>
wrote:
Hello
while hunting a link stability (packet transmission stop) issue i
discovered
a maybe cosmetic, but maybe als serious issue.
AP is a QCA9880 3x3 card configured as WDS AP
Station is a QCA9880 2x2 card configured as WDS STA
the TX rate of the station matches to the rx rate of the AP.
but the RX rate of the station is wrong as it seems which may be a
cause
of
the issue.
could this be a firmware bug on QCA9880?
output of fw_stats
WDS AP:
Peer MAC address 40:a5:ef:85:4d:6f
Peer RSSI 12
Peer TX rate 175500
Peer RX rate 175500
Peer RX duration 0
WDS STA:
Peer MAC address 40:a5:ef:51:49:db
Peer RSSI 13
Peer TX rate 175500
Peer RX rate 351000
Peer RX duration 0
[...]
Is this reproducible? Can you try setting a fixed tx bitrate (`iw
wlanX set bitrates legacy-5 ht-mcs vht-mcs 1:4` to force vht mcs=4,
nss=1) to see if it makes any difference? Perhaps rate-control and tx
try-list/status are not parsed properly (for statistical purposes) in
firmware which ends up with invalid peer-tx-rate on WDS AP.
lets try. can you correct the syntax? the following is not correct
iw dev ath1 set bitrates legacy-5 ht-mcs vht-mcs 1:4
Usage: iw [options] dev <devname> set bitrates [legacy-<2.4|5>
<legacy rate
in Mbps>*] [ht-mcs-<2.4|5> <MCS index>*] [v
ht-mcs-<2.4|5> <NSS:MCSx,MCSy... | NSS:MCSx-MCSy>*] [sgi-2.4|lgi-2.4]
[sgi-5|lgi-5]
Sets up the specified rate masks.
Not passing any arguments would clear the existing mask (if any).
Ah, sorry, my bad.
iw dev ath1 set bitrates legacy-5 ht-mcs-5 vht-mcs-5 1:4
(ht-mcs and vht-mcs were missing "-5" suffix)
As a sidenote: The logic here is that you need to explicitly tell that
you want empty set of legacy rates and empty set of HT rates and only
a single VHT rate to be set (all explicitly for 5ghz band). This makes
sure that FW rate control is ignored and a fixed rate is used for all
data transmissions (and this should also build tx try-lists without
any fancy retries/fallbacks to different rates).
after setting this setting on ap. i get the following results:
sta:
rx bitrate: 175.5 MBit/s VHT-MCS 4 80MHz VHT-NSS 1
Peer TX rate 234000
Peer RX rate 175500
AP:
rx bitrate: 175.5 MBit/s VHT-MCS 4 80MHz VHT-NSS 1
Peer TX rate 263300
Peer RX rate 175500
this looks even more curious
Michał
--
Mit freundlichen Grüssen / Regards
Sebastian Gottschall / CTO
NewMedia-NET GmbH - DD-WRT
Firmensitz: Berliner Ring 101, 64625 Bensheim
Registergericht: Amtsgericht Darmstadt, HRB 25473
Geschäftsführer: Peter Steinhäuser, Christian Scheele
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