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

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Message-ID: <b994a256-ee2f-4831-ad61-288ae7bc864b@heusel.eu>
Date: Fri, 28 Feb 2025 11:19:52 +0100
From: Christian Heusel <christian@...sel.eu>
To: Ming Yen Hsieh <mingyen.hsieh@...iatek.com>, stable@...r.kernel.org
Cc: Benjamin Xiao <fossben@...me>, linux-kernel@...r.kernel.org, 
	regressions@...ts.linux.dev, linux-mediatek@...ts.infradead.org, 
	linux-wireless@...r.kernel.org
Subject: [REGRESSION][BISECTED][STABLE] MT7925 wifi throughput halved with
 6.13.2

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")

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

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