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
Hmm.. Interesting. FWIW these are "last tx/rx rate". This isn't
average nor anything fancy like that.
this is in sync yes. its also not that i just observed it for a second.
this test installation is running here for a while
and while looking for the cause i observed this behavior.
Can you compare that to `iw wlanX station dump`, please? It should
report last rx bitrate at least (tx bitrate is broken so don't rely on
that). The 175.5 and 351 seem to be both vht mcs index=4 but with
differet nss values (1 or 2 spatial streams).
iw station dump shows the same rate
peer rx rate and iw dump is identical
STA:
Peer RX rate 526500
rx bitrate: 526.6 MBit/s VHT-MCS 6 80MHz VHT-NSS 2
AP:
AP
Peer TX rate 234000
interesting here is that the TX rate on STA side matches to the RX rate
on AP side, but not vice versa
I do wonder at what rate frames are actually transmitted OTA.
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).
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
http://www.dd-wrt.com
email: [email protected]
Tel.: +496251-582650 / Fax: +496251-5826565
_______________________________________________
ath10k mailing list
[email protected]
http://lists.infradead.org/mailman/listinfo/ath10k
