ath11k: QCN9074: low HE-MCS index
Linux regression tracking (Thorsten Leemhuis)
regressions at leemhuis.info
Mon Jun 26 06:50:40 PDT 2023
On 26.06.23 14:27, Tanguy Serrat wrote:
>
> 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).
FWIW for anyone seeing this that might wonder: yes, this is the same
issue that is already brought up on the lists here:
https://lore.kernel.org/all/1326a6e4-758d-3344-d90c-8a126748b034@gmail.com/
Sadly nothing much came from it (and coincidentally I tried to revive
that thread a few minutes after Tanguy Serrat sent the quoted mail,
which was an hour before I saw it -- aka: race condition). Well, maybe
one of these mails hopefully will help.
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.
#regzbot ^backmonitor: d90c-8a126748b034 at gmail.com/
> 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 ?
>
> Thank you !
> Tanguy
>
>
More information about the ath11k
mailing list