linux-kernel - Re: [REGRESSION][BISECTED] Double energy consumption on idle

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Message-ID: <Z2vmiUyIcvE8vV0b@wunner.de>
Date: Wed, 25 Dec 2024 12:03:37 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Kurt Borja <kuurtb@...il.com>
Cc: linux-crypto@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION][BISECTED] Double energy consumption on idle

On Tue, Dec 24, 2024 at 07:42:49PM -0500, Kurt Borja wrote:
> When I first booted into v6.13 I noticed my laptop got instantly hotter
> and battery started draining fast. Today I bisected the kernel an ran
> powerstat [1]. It comes down to
> 
> Upstream commit: 6b34562f0cfe ("crypto: akcipher - Drop sign/verify operations")
[...]
> Graphics:
>   Device-1: Intel TigerLake-H GT1 [UHD Graphics] driver: i915 v: kernel
>   Device-2: NVIDIA GA104M [GeForce RTX 3070 Mobile / Max-Q] driver: nvidia
>     v: 565.77

I note that you're using the out-of-tree nvidia driver on v6.12.

The driver may be using the portions of the akcipher API that were
removed by the commit you bisected to.  E.g. this source file calls
crypto_akcipher_verify():

https://github.com/NVIDIA/open-gpu-kernel-modules/blob/main/kernel-open/nvidia/libspdm_ecc.c

Are you seeing build or load errors for the nvidia module?

If the module is not loaded, no voltage / frequency scaling happens,
which would indeed result in the dGPU consuming an awful lot of power.

Thanks,

Lukas