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Message-ID: <2e512646-816f-ff98-d466-b82f3a7d05ef@leemhuis.info>
Date:   Fri, 28 Jul 2023 15:42:29 +0200
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Subject: Re: Fwd: XPS 17 9730 runs significantly warmer on Kernel 6.5-rc3
 compared to Kernel 6.4.3
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To:     Bagas Sanjaya <bagasdotme@gmail.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Power Management <linux-pm@vger.kernel.org>,
        Goran <goran.brkuljan@gmail.com>,
        Amit Daniel Kachhap <amit.kachhap@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Viresh Kumar <viresh.kumar@linaro.org>
References: <107f05b8-0104-501c-130c-4f89f3f8a628@gmail.com>
From:   Thorsten Leemhuis <regressions@leemhuis.info>
In-Reply-To: <107f05b8-0104-501c-130c-4f89f3f8a628@gmail.com>
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[CCing Thermal maintainer Rafael, maybe he can help guide us]

Hi Bagas and everyone!

On 27.07.23 16:24, Bagas Sanjaya wrote:
>
> I notice a regression report on Bugzilla [1].

Bagas, it looks like you forwarded this to the maintainers of
"THERMAL/CPU_COOLING"; I think "THERMAL" would have been the way better
entry in MAINTAINERS, as many (all?) of the former are Linaro employees
and thus primarily care about ARM based devices. That's why I CCed Rafael.

> Quoting from it:
> 
>> On my new XPS 17 9730 laptop, I recently installed the Kernel 6.5-rc3. I noticed, however, that during its operation, the laptop was getting significantly warmer than before. I did some analysis using the 'stress' tool to measure and compare the difference in CPU temperatures between Kernel 6.4.3 and Kernel 6.5-rc3. Here are my results:

One thought: I wonder if there something wrong now or was there
something wrong earlier that was fixed to unleash the full performance
potential of the device. That 100°C there sounds like it's the latter
case, as that's the TJUNCTION temp for that processor. But would be good
to confirm from someone that knows better how hot such processors are
allowed to get these days.

Ciao, Thorsten

>> OS: Ubuntu 23.10
>> CPU: i7-13700H
>>
>> kernel 6.4.3:
>>                                                                                                                                                                                         
>> Initial CPU temperature:
>> coretemp-isa-0000
>> Core 0:        +47.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 4:        +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 8:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 12:       +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 16:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 20:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 24:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 25:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 26:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 27:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 28:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 29:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 30:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 31:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Stressing CPU for 30 seconds...
>> stress: info: [4858] dispatching hogs: 14 cpu, 0 io, 0 vm, 0 hdd
>> stress: info: [4858] successful run completed in 30s
>> CPU temperature immediately after stress test:
>> coretemp-isa-0000
>> Core 0:        +67.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 4:        +76.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 8:        +69.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 12:       +77.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 16:       +69.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 20:       +76.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 24:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 25:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 26:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 27:       +68.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 28:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 29:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 30:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 31:       +71.0°C  (high = +100.0°C, crit = +100.0°C)
>> Test ended at: Tue Jul 25 01:10:16 PM CEST 2023
>>
>>
>> kernel 6.5-rc-3:
>>
>> Initial CPU temperature:
>> coretemp-isa-0000
>> Core 0:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 4:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 8:        +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 12:       +46.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 16:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 20:       +44.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 24:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 25:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 26:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 27:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 28:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 29:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 30:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 31:       +45.0°C  (high = +100.0°C, crit = +100.0°C)
>> Stressing CPU for 30 seconds...
>> stress: info: [11146] dispatching hogs: 14 cpu, 0 io, 0 vm, 0 hdd
>> stress: info: [11146] successful run completed in 30s
>> CPU temperature immediately after stress test:
>> coretemp-isa-0000
>> Core 0:        +84.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 4:        +97.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 8:        +87.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 12:      +100.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 16:       +86.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 20:       +99.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 24:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 25:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 26:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 27:       +83.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 28:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 29:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 30:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
>> Core 31:       +89.0°C  (high = +100.0°C, crit = +100.0°C)
>> Test ended at: Tue Jul 25 01:05:42 PM CEST 2023
>>
>> I tested few times with different setup and CPU temp on 6.5-rc3 is always higher especially when stressing with fewer cores.
> 
> See Bugzilla for the full thread.
> 
> Goran: On Tuesday, I asked you to perform bisection. Any update on it?
> 
> Anyway, I'm adding this regression to regzbot:
> 
> #regzbot introduced: v6.4..v6.5-rc3 https://bugzilla.kernel.org/show_bug.cgi?id=217703
> #regzbot title: significant temperature increase on XPS 17 9730
> 
> Thanks.
> 
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217703
>