linux-kernel - Re: platform/x86/intel/pmc: regression found in commit 804951203aa541ad6720c9726c173d18aeb3ab6b

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Date:   Tue, 14 Nov 2023 11:08:35 +0000
From:   James Hutchinson <jahutchinson99@...glemail.com>
To:     "Box, David E" <david.e.box@...el.com>
Cc:     "Pardee, Xi" <xi.pardee@...el.com>,
        rajneesh bhardwaj <irenic.rajneesh@...il.com>,
        "ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: platform/x86/intel/pmc: regression found in commit 804951203aa541ad6720c9726c173d18aeb3ab6b

No problems - have logged this in Bugzilla as #218143:

https://bugzilla.kernel.org/show_bug.cgi?id=218143

Regards,
James.

On Mon, 13 Nov 2023 at 18:04, Box, David E <david.e.box@...el.com> wrote:
>
> Hi James,
>
> Can you file a bug at https://bugzilla.kernel.org/ under Power Management? Let us know what the bug number is. Thanks.
>
> David
> ________________________________
> From: James Hutchinson <jahutchinson99@...glemail.com>
> Sent: Monday, November 13, 2023 7:42 AM
> To: Pardee, Xi <xi.pardee@...el.com>; rajneesh bhardwaj <irenic.rajneesh@...il.com>; Box, David E <david.e.box@...el.com>; ilpo.jarvinen@...ux.intel.com <ilpo.jarvinen@...ux.intel.com>; hdegoede@...hat.com <hdegoede@...hat.com>
> Cc: platform-driver-x86@...r.kernel.org <platform-driver-x86@...r.kernel.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>
> Subject: platform/x86/intel/pmc: regression found in commit 804951203aa541ad6720c9726c173d18aeb3ab6b
>
> Running here on an Intel NUC 8i3BEH Coffee Lake machine under Arch Linux.
>
> Connected to this machine I have 4x USB DVB Cards (2xDVBSky S960
> DVB-S2 adapters & 2xGeniatech T230 DVB-T2 adapters), and I stream TV
> Channels around the house via Tvheadend.
>
> Since linux kernel v6.5 onwards I noticed a bad performance regression
> whereby the streams are basically unstable. There are tons of
> continuity errors in the Tvheadend logfile, and the picture and sound
> are badly broken up as though the system is throttled or does not have
> the bandwidth to cope with the streams.
>
> Sometimes the stream will work for a minute or so after reboot, before
> then becoming unstable, and then seems to remain unstable until the
> next cold reboot.
>
> I dropped back to v6.1 LTS (where everything is fine) and re-tested
> following the release of v6.6...
> ...the problem had not gone away so I performed a git bisect to
> identify the culprit and found this to be:
>
> 804951203aa541ad6720c9726c173d18aeb3ab6b: platform/x86:intel/pmc:
> Combine core_init() and core_configure()
>
> I can work around the issue by either reverting this commit or by
> disabling CONFIG_INTEL_PMC_CORE and rebuilding the kernel manually,
> either of which results in perfect DVB streaming once more.
>
> Happy to test any potential patches or otherwise provide further
> information as required.
>
>
> James.