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, 23 Sep 2023 06:52:07 +1000
From:   brett hassall <brett.hassall@...il.com>
To:     Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        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 don't think it is a duplicate.

https://bugzilla.kernel.org/show_bug.cgi?id=217841 affects systems
with VMD controllers. I searched the lspci output from
https://bugzilla.kernel.org/show_bug.cgi?id=217321 and the system does
not have a VMD controller.

I also checked that patch code and it does not appear related.

Thanks

On Thu, 21 Sept 2023 at 00:09, Thorsten Leemhuis
<regressions@...mhuis.info> wrote:
>
> On 16.09.23 01:04, brett hassall wrote:
> >
> > 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
>
> Is that maybe a duplicate of this one:
> https://bugzilla.kernel.org/show_bug.cgi?id=217321
>
> In that case it might make sense to test with a proposed fix for that
> bug (that iirc is
> https://lore.kernel.org/all/20230911073352.3472918-1-mika.westerberg@linux.intel.com/
> ) to speed up fixing the rtw88 regression in case there is one.
>
> Ciao, Thorsten
>
> > 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.
> >>
> >>
> >
> >