linux-kernel - Re: Fwd: 5c8a79e8e12b ("wifi: rtw88: correct PS calculation for SUPPORTS_DYNAMIC_PS", 2023-05-27) increases CPU usage usage for irq

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Date:   Sat, 16 Sep 2023 09:04:19 +1000
From:   brett hassall <brett.hassall@...il.com>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Bagas Sanjaya <bagasdotme@...il.com>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Wireless <linux-wireless@...r.kernel.org>
Subject: Re: Fwd: 5c8a79e8e12b ("wifi: rtw88: correct PS calculation for
 SUPPORTS_DYNAMIC_PS", 2023-05-27) increases CPU usage usage for irq

Hi

I'd suggest that there are actually 2 regressions
(https://bugzilla.kernel.org/show_bug.cgi?id=217841 and this bug). Bug
217841 masks this bug as it prevents the laptop reaching package C8
and I'm assuming this bug shows when in C8. The patch for 21784 only
affects devices connected to a VMD controller so I wouldn't expect it
to affect the 8822CE.

Options that I can see are:
1. Park this bug until 217841 is resolved
2. Try to test on a laptop with a Realtek 8822CE but not a VMD
controller. I have access to 5 different laptop models but none meet
those criteria.


Thanks for the reply
Brett

On Mon, 11 Sept 2023 at 23:29, Linux regression tracking (Thorsten
Leemhuis) <regressions@...mhuis.info> wrote:
>
> On 27.08.23 04:37, Bagas Sanjaya wrote:
> >
> > I notice a regression report on Bugzilla [1]. Quoting from it:
> >
> >> This commit improves power saving - it enables the kernel to
> >> achieve package C8. To achieve package C8, 3 Ubuntu VMD commits
> >> must be applied as well. [...]
>
> To me that sounds like there is no upstream problem, hence this
> shouldn't be tracked as a regression. Please correct me if I'm wrong.
>
> > #regzbot introduced: 26a125f550a3bf
> > https://bugzilla.kernel.org/show_bug.cgi?id=217828 #regzbot title:
> > correcting SUPPORTS_DYNAMIC_PS calculation for rtw88 increases CPU
> > utilization #regzbot link:
> > https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.2/+bug/2025040
> >
> > Thanks.
> >
> > [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217828
>
> #regzbot resolved: invalid: seems to only be a problem with a patched kernel
> #regzbot ignore-activity
>
> 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.
>
>