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From: Thorsten Leemhuis <regressions@leemhuis.info>
To: Idzibear <Idzibear@kaputniks.org>
Cc: linux-kernel@vger.kernel.org, regressions@lists.linux.dev,
	torvalds@linux-foundation.org
Subject: Re: Thorsten is tracking regression again and could need a little help (was: Re: Linux 5.15)
Date: Mon, 1 Nov 2021 13:54:21 +0100	[thread overview]
Message-ID: <ef02dfde-a3af-af65-2749-eae9f4b1e367@leemhuis.info> (raw)
In-Reply-To: <c11d94b4-1701-4e26-efd1-42038342c4aa@kaputniks.org>

On 01.11.21 12:46, Idzibear wrote:
> https://www.reddit.com/r/linux/comments/qjyxso/the_515_kernel_has_been_released/hitiykt/
> 
> I just noticed something strange. I'm experimenting with some repurposed
> Desktop-PC to make it maybe into a homelab server.
> 
> I ran Kernel 5.14.10, and I had an idle usage of 19-22 watts. Updated to
> 5.15 and it went to 27-29 watts. Went back to 5.14.10 and it went down
> to 19-22 watts again. WTF?

thx for the report, yeah, sound like a regression. With that much of a
difference I'd suspect it's something that can consume a lot of power if
not sleeping properly, for example the CPU or the GPU. But that's just a
shot in the dark and it's hard to help here with debugging from a
distance (especially without a list of hardware components). With a bit
of luck tools like powertop might be able to debug this (check if the
CPU is sleeping well). But a 'git bisect', like already suggested
Gregkh, would be really the best to find the change that's causing this.

Ciao, Thorsten

#regzbot ^introduced: v5.14..v5.15
#regzbot title: idle power increased from ~20 to ~28 watts

  parent reply	other threads:[~2021-11-01 12:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAHk-=wjfbfQobW2jygMvgfJXKmzZNB=UTzBrFs2vTEzVpBXA4Q@mail.gmail.com>
2021-11-01  4:49 ` Thorsten Leemhuis
2021-11-01 11:46   ` Idzibear
2021-11-01 11:56     ` Greg KH
2021-11-01 12:54     ` Thorsten Leemhuis [this message]
2021-11-01 12:33   ` Greg KH
2021-11-01 12:44     ` Thorsten Leemhuis
2021-11-01 13:03       ` Greg KH
2021-11-01 13:34         ` Thorsten Leemhuis
2021-11-01 15:27           ` Greg KH
2021-11-01 16:19             ` Thorsten Leemhuis

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