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

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Message-ID: <JZIl1iVcv9U3s8KnXJqR-ZKFBUzbVvbqR3NN0LO4as5_yXxPPS4yIfzGK22Z6rNZOyOysBzWPZGQgL-8eychueJtr7TvC3A0I-s3CVHHDUo=@pm.me>
Date: Fri, 28 Feb 2025 17:44:38 +0000
From: fossben@...me
To: Peter Seiderer <ps.report@....net>
Cc: Christian Heusel <christian@...sel.eu>, Ming Yen Hsieh <mingyen.hsieh@...iatek.com>, stable@...r.kernel.org, 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 all!

Christian provided me with a linux-mainline-6.14rc4-1-x86_64 package to test with today and I am still experiencing the issue, so I am assuming that revert did not happen yet.

To give some additional context for the performance regression, I have an AT&T 500/500 fiber line. As of this morning on kernel 6.13.1, I get 550 down / 470 up over Wifi 6 on speedtest.net. Testing immediately afterwards with Christian's mainline package, I got a result of 170 down / 75 up, which is similar to the results that I got for all the other bisection kernels Christian gave me to test.

Thanks!
Ben


On Friday, February 28th, 2025 at 9:14 AM, Peter Seiderer <ps.report@....net> wrote:

> 
> 
> Hello Christian,
> 
> On Fri, 28 Feb 2025 11:19:52 +0100, Christian Heusel christian@...sel.eu wrote:
> 
> > Hello everyone,
> > 
> > on the Arch Linux Bugtracker1 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