linux-kernel - Re: [REGRESSION][BISECTED][STABLE] MT7925 wifi throughput halved with 6.13.2

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Message-ID: <20250228161420.11ac4696@gmx.net>
Date: Fri, 28 Feb 2025 16:14:20 +0100
From: Peter Seiderer <ps.report@....net>
To: Christian Heusel <christian@...sel.eu>
Cc: Ming Yen Hsieh <mingyen.hsieh@...iatek.com>, stable@...r.kernel.org,
 Benjamin Xiao <fossben@...me>, linux-kernel@...r.kernel.org,
 regressions@...ts.linux.dev, linux-mediatek@...ts.infradead.org,
 linux-wireless@...r.kernel.org
Subject: Re: [REGRESSION][BISECTED][STABLE] MT7925 wifi throughput halved
 with 6.13.2

Hello Christian,

On Fri, 28 Feb 2025 11:19:52 +0100, Christian Heusel <christian@...sel.eu> wrote:

> Hello everyone,
>
> on the Arch Linux Bugtracker[1] Benjamin (also added in CC) reported
> that his MT7925 wifi card has halved it's throughput when updating from
> the v6.13.1 to the v6.13.2 stable kernel. The problem is still present
> in the 6.13.5 stable kernel.
>
> We have bisected this issue together and found the backporting of the
> following commit responsible for this issue:
>
>     4cf9f08632c0 ("wifi: mt76: mt7925: Update mt7925_mcu_uni_[tx,rx]_ba for MLO")

Seems there is already a suggested revert of the mentioned commit, see

	[PATCH v4 1/6] Revert "wifi: mt76: mt7925: Update mt7925_mcu_uni_[tx,rx]_ba for MLO"
	https://lore.kernel.org/linux-wireless/20250226025647.102904-1-sean.wang@kernel.org/#r

Regards,
Peter


>
> We unfortunately didn't have a chance to test the mainline releases as
> the reporter uses the (out of tree) nvidia modules that were not
> compatible with mainline release at the time of testing. We will soon
> test against Mainline aswell.
>
> I have attached dmesg outputs of a good and a bad boot aswell as his
> other hardware specs and will be available to debug this further.
>
> Cheers,
> Christian
>
> [1]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/112