ath11k: QCN9074: low HE-MCS index

[Tanguy Serrat]

Dear Kalle,

Thank you for your reply.

I have opened two separate issues:
1) https://bugzilla.kernel.org/show_bug.cgi?id=217536 - related to a
previous issue I encountered.

2) https://bugzilla.kernel.org/show_bug.cgi?id=217652 - related to this feed.

I have tested 3m apart, as described in 217652, results are just
slightly better in terms of reported MCS. I still seem to be missing
all capabilities over 7.
I have attached the full dmesg log and .config file to the bug report

Le mar. 11 juil. 2023 à 08:49, Kalle Valo <kvalo at kernel.org> a écrit :
>
> Tanguy Serrat <tanguy at squaremind.io> writes:
>
> > Hi everyone,
> >
> > In my quest to get 2x QCN9074 paired and achieving high throughput
> > data transfers, I am now facing issues with the AP configuration.
> >
> > Specifically, I cannot get more than HE-MCS 5 (AP and client 50cm
> > apart) although SNR and RSSI are always very strong and supposedly in
> > specs (SNR > 40db or RSSI < -48db).
> >
> > iw wlp6s0 link
> > Connected to 00:15:61:27:cd:dc (on wlp6s0)
> > SSID: Space
> > freq: 5745
> > RX: 1073584482 bytes (708567 packets)
> > TX: 355824214 bytes (256143 packets)
> > signal: -40 dBm
> > rx bitrate: 1729.3 MBit/s 160MHz HE-MCS 4 HE-NSS 4 HE-GI 0 HE-DCM 0
> > tx bitrate: 1729.3 MBit/s 160MHz HE-MCS 4 HE-NSS 4 HE-GI 0 HE-DCM 0
> >
> > In this case iperf3 shows ~950Mbits/s transfer speed. I am hoping to
> > get at least twice as much.
> >
> > It seems to me that either mac80211, ath11k or hostapd are not
> > advertising the available capabilities correctly. I have tried setting
> > hostapd he_basic_mcs_set=65530 or others but did not help.
> >
> > I have added ieee80211_regdom=FR option to cfg80211 module on the AP
> > side. Channel selection is done with ACS survey. I also tried other
> > channels/frequencies without success eg. 5500Mhz.
> >
> > iw reg get
> > global
> > country FR: DFS-ETSI
> > (2400 - 2483 @ 40), (N/A, 20), (N/A)
> > (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
> > (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
> > (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
> > (5725 - 5875 @ 80), (N/A, 13), (N/A)
> > (5945 - 6425 @ 160), (N/A, 23), (N/A), NO-OUTDOOR
> > (57000 - 71000 @ 2160), (N/A, 40), (N/A)
> >
> > phy#0 (self-managed)
> > country US: DFS-FCC
> > (2402 - 2472 @ 40), (6, 30), (N/A)
> > (5170 - 5250 @ 80), (N/A, 30), (N/A), AUTO-BW
> > (5250 - 5330 @ 80), (N/A, 24), (0 ms), DFS, AUTO-BW
> > (5490 - 5730 @ 160), (N/A, 24), (0 ms), DFS, AUTO-BW
> > (5735 - 5895 @ 160), (N/A, 30), (N/A), AUTO-BW
> > (5945 - 7125 @ 160), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW
> >
> > Current setup is:
> > - Intel x86
> > - Ubuntu 22.04
> > - Kernel built from ath 6.4.0-rc6-wt-ath+ (commit:
> > c60d15f389ef9832a8da410e438d81b10327751f)
> > with commit reverted from the bug ticket I opened
> > (https://bugzilla.kernel.org/show_bug.cgi?id=217536).
> > - 1x QCN9074 as AP, 1x as managed client 50cm apart
> > - Both AP and Client are running with the latest 2.7.0 FW.
> >
> > I have started from this ticket
> > (https://bugzilla.kernel.org/show_bug.cgi?id=217286) hostapd config
> > file, and adapted, please find attached.
> >
> > Anyone seeing what could be my issue / how I could debug further ?
>
> As a start please file this to bugzilla as a new bug. Always one issue
> per report, please. Otherwise it's a nightmare to manage the bug
> reports.
>
> https://wireless.wiki.kernel.org/en/users/drivers/ath11k/bugreport
>
> Try to provide as much as information as you can to the report. You said
> that you have tested it 50 cm apart but have you tested it, for example,
> 3 m apart? Please also include your full kernel .config file and dmesg
> output.
>
> --
> https://patchwork.kernel.org/project/linux-wireless/list/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches