linux-kernel - boot performance: ACPI delays in boot up of Alder Lake laptop (Dell XPS 13 9315)

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Message-ID: <02604223-af8a-a86f-8873-19a4dbb3035b@molgen.mpg.de>
Date:   Tue, 13 Sep 2022 16:05:52 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dell.Client.Kernel@...l.com,
        Hans de Goede <hdegoede@...hat.com>
Subject: boot performance: ACPI delays in boot up of Alder Lake laptop (Dell
 XPS 13 9315)

Dear Linux folks,


Just a heads-up, on the Dell XPS 13 9315 over half a second during boot 
seem to be due to delays in firmware provided ACPI/ASL.

     […]
     [    0.000000] DMI: Dell Inc. XPS 9315/02GGG1, BIOS 1.1.3 05/11/2022
     […]
     [    0.220268] ACPI: PM: Power Resource [D3C]
     [    0.472079] ACPI: PM: Power Resource [PIN]
     […]
     [    0.512316] pci 0000:00:07.1:   bridge window [mem
0x74000000-0x960fffff]
     [    0.512319] pci 0000:00:07.1:   bridge window [mem
0x6040000000-0x6075ffffff 64bit pref]
     [    0.888002] ACPI: EC: interrupt unblocked
     [    0.888002] ACPI: EC: event unblocked
     [    0.888062] ACPI: EC: EC_CMD/EC_SC=0x934, EC_DATA=0x930
     [    0.888062] ACPI: EC: GPE=0x6e
     […]

I created two bug reports [1][2] for each of these delays. 
Unfortunately, the device is used in production by a user, so I can’t do 
any testing.

Linux taking less than 0.5 seconds to execute on modern consumer 
hardware still should be a goal in my opinion.


Kind regards,

Paul


[1]: https://bugzilla.kernel.org/show_bug.cgi?id=216481
[2]: https://bugzilla.kernel.org/show_bug.cgi?id=216482