[Bug 2058752] Re: ath11k high jitter and packet loss when operating in 802.11ax mode

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux (Ubuntu)
Status: New => Confirmed

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Title:
ath11k high jitter and packet loss when operating in 802.11ax mode

Status in linux package in Ubuntu:
Confirmed

Bug description:
On 6.5.0-26-generic, my QCNFA765 cannot really operate in 802.11ax
mode.

I have a Thinkpad P16s Gen 2 with a (soldered, sadly) QCNFA765 card, which uses the ath11k driver.
I also have a Ruckus R650 AP, which supports wifi6.

Connecting the two and pinging the AP yields the following:

```
64 bytes from 192.168.16.77: icmp_seq=45 ttl=64 time=22.4 ms
64 bytes from 192.168.16.77: icmp_seq=46 ttl=64 time=29.6 ms
64 bytes from 192.168.16.77: icmp_seq=47 ttl=64 time=26.8 ms
64 bytes from 192.168.16.77: icmp_seq=48 ttl=64 time=2174 ms
64 bytes from 192.168.16.77: icmp_seq=49 ttl=64 time=1158 ms
64 bytes from 192.168.16.77: icmp_seq=50 ttl=64 time=130 ms
64 bytes from 192.168.16.77: icmp_seq=51 ttl=64 time=503 ms
64 bytes from 192.168.16.77: icmp_seq=54 ttl=64 time=1832 ms
64 bytes from 192.168.16.77: icmp_seq=55 ttl=64 time=808 ms
64 bytes from 192.168.16.77: icmp_seq=56 ttl=64 time=9.32 ms
64 bytes from 192.168.16.77: icmp_seq=57 ttl=64 time=2.11 ms
64 bytes from 192.168.16.77: icmp_seq=58 ttl=64 time=25.6 ms
64 bytes from 192.168.16.77: icmp_seq=59 ttl=64 time=30.9 ms
64 bytes from 192.168.16.77: icmp_seq=60 ttl=64 time=95.6 ms
^C
--- 192.168.16.77 ping statistics ---
60 packets transmitted, 55 received, 8.33333% packet loss, time 59273ms
rtt min/avg/max/mdev = 2.105/275.084/2344.792/560.334 ms, pipe 3
```

Those periodic bursts of >1s latency make some webpages fail to load
and videochats unusable.

No interference is present in my channel of choice.

Nothing interesting is printed in dmesg while the above occurs.

The above does not happen if:
* I disable wifi 6 in the AP
* I ping a wifi 5 AP (I also have an older R710, which is a 802.11ac AP)
* I ping the R650 in wifi 6 mode from a AX210 on kernel 6.2
* I ping the R650 from a completely different OS and device (e.g. Android)

I'll test with a 24.04 daily image next.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: linux-image-6.5.0-26-generic 6.5.0-26.26
ProcVersionSignature: Ubuntu 6.5.0-26.26-generic 6.5.13
Uname: Linux 6.5.0-26-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 21 16:58:07 2024
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: root=zfs:zroot/ROOT/ubuntu quiet loglevel=4 rtc_cmos.use_acpi_alarm=1 spl.spl_hostid=0x4605c990
RelatedPackageVersions:
linux-restricted-modules-6.5.0-26-generic N/A
linux-backports-modules-6.5.0-26-generic N/A
linux-firmware 20230919.git3672ccab-0ubuntu2.9
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/15/2024
dmi.bios.release: 1.18
dmi.bios.vendor: LENOVO
dmi.bios.version: R2FET38W (1.18 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21K9001NUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.11
dmi.modalias: dmi:bvnLENOVO:bvrR2FET38W(1.18):bd01/15/2024:br1.18:efr1.11:svnLENOVO:pn21K9001NUS:pvrThinkPadP16sGen2:rvnLENOVO:rn21K9001NUS:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21K9_BU_Think_FM_ThinkPadP16sGen2:
dmi.product.family: ThinkPad P16s Gen 2
dmi.product.name: 21K9001NUS
dmi.product.sku: LENOVO_MT_21K9_BU_Think_FM_ThinkPad P16s Gen 2
dmi.product.version: ThinkPad P16s Gen 2
dmi.sys.vendor: LENOVO

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