linux-kernel - Re: regression/bisected/6.9 commit 587d67fd929ad89801bcc429675bda90d53f6592 decrease 30% of gaming performance

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Date: Mon, 01 Apr 2024 16:48:23 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc: Takashi Iwai <tiwai@...e.de>,
	Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
	linux-sound@...r.kernel.org
Subject: Re: regression/bisected/6.9 commit 587d67fd929ad89801bcc429675bda90d53f6592 decrease 30% of gaming performance

On Mon, 01 Apr 2024 15:49:33 +0200,
Mikhail Gavrilov wrote:
> 
> On Mon, Apr 1, 2024 at 4:41 PM Takashi Iwai <tiwai@...e.de> wrote:
> > The only code of the commit 587d67fd929a is the close of ALSA timer
> > device.  If it really matters, it implies that the user-space seems
> > trying to open/close the ALSA timer device so frequently.
> >
> > Are you using ALSA dmix/dsnoop?  It would explain.
> 
> It's new words for me. I didn’t configure anything like this myself,
> only if the maintainers of my distribution enable it by default.
> I only know that Fedora Rawhide uses Pipewire for mixing sound.

Then it shouldn't be dmix/dsnoop.  You'd better try profiling what's
going on there.  e.g. try to get perf results with and without the
commit.


Takashi