linux-kernel - [regression] Significant WiFi Speed Reduction with Kernel Versions

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Message-ID: <7a43d26e-95eb-49d4-bc02-434c239909ff@leemhuis.info>
Date: Wed, 7 Aug 2024 11:12:19 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Mukesh Sisodiya <mukesh.sisodiya@...el.com>
Cc: Miri Korenblit <miriam.rachel.korenblit@...el.com>,
 Johannes Berg <johannes.berg@...el.com>,
 "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>,
 Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: [regression] Significant WiFi Speed Reduction with Kernel Versions >
 6.8.12 on Intel Wi-Fi 6 AX203

Hi, Thorsten here, the Linux kernel's regression tracker.

Mukesh Sisodiya, I noticed a report about a regression in
bugzilla.kernel.org that appears to be caused by a change of yours:

099a47dbe71b75 ("wifi: iwlwifi: Add support for new 802.11be device")
[v6.9-rc1]

As many (most?) kernel developers don't keep an eye on the bug tracker,
I decided to write this mail. To quote from
https://bugzilla.kernel.org/show_bug.cgi?id=219114 :

> I am experiencing a significant reduction in WiFi download speeds when
> using any Linux kernel version greater than 6.8.12. The issue does not
> occur with kernel versions 6.8.12 or lower. The only change is the
> firmware version loaded by the kernel (I have attached the full output
> of "dmesg | grep iwlwifi" for both kernel versions as text files). I
> have also tried downgrading the firmware, but it did not resolve the
> issue. The problem occurs across different Linux distributions,
> indicating that it is related to the default kernel.
> 
> Hardware Details:
> 
> Laptop Model: Acer Nitro 5 AN-515-58
> Network Card: Intel® Wi-Fi 6 AX203, REV=0x370
> CPU: Intel i7-12700H
> Bluetooth: Intel Corp. AX201 Bluetooth
> 
> Additional Information:
> 
> lspci -nnkv | sed -n ‘/Network/,/^$/p’:
> 0000:00:14.3 Network controller [0280]: Intel Corporation Alder Lake-P PCH CNVi WiFi [8086:51f0] (rev 01)
>         Subsystem: Rivet Networks Dual Band Wi-Fi 6(802.11ax) Killer AX1650i 160MHz 2x2 [Cyclone Peak] [1a56:1652]
>         Flags: bus master, fast devsel, latency 0, IRQ 16, IOMMU group 10
>         Memory at 6105274000 (64-bit, non-prefetchable) [size=16K]
>         Capabilities: <access denied>
>         Kernel driver in use: iwlwifi
>         Kernel modules: iwlwifi
> 
> lsusb | grep Bluetooth:
> Bus 003 Device 003: ID 8087:0026 Intel Corp. AX201 Bluetooth
> 
> Thank you for your assistance.

See the ticket for more details and the bisection. Note, you have to use
bugzilla to reach the reporter, as I sadly[1] can not CCed them in mails
like this.

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.

[1] because bugzilla.kernel.org tells users upon registration their
"email address will never be displayed to logged out users"

P.S.: let me use this mail to also add the report to the list of tracked
regressions to ensure it's doesn't fall through the cracks:

#regzbot introduced: 099a47dbe71b75
#regzbot title: wifi: iwlwifi: WiFi Speed Reduction on Intel Wi-Fi 6 AX203
#regzbot from: siero.o.p.33
#regzbot duplicate: https://bugzilla.kernel.org/show_bug.cgi?id=219114
#regzbot ignore-activity