https://bugzilla.kernel.org/show_bug.cgi?id=216482
Bug ID: 216482
Summary: boot performance: 360 ms spent before `ACPI: EC:
interrupt unblocked`
Product: ACPI
Version: 2.5
Kernel Version: 5.19
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: BIOS
Assignee: acpi_b...@kernel-bugs.osdl.org
Reporter: pmenzel+bugzilla.kernel....@molgen.mpg.de
Regression: No
Created attachment 301802
--> https://bugzilla.kernel.org/attachment.cgi?id=301802&action=edit
Linux 5.19 messages (output of `dmesg`)
On a Dell XPS 9315/02GGG1, BIOS 1.1.3 05/11/2022, Linux 5.19 shows that 360 ms
are spent before `ACPI: EC: interrupt unblocked`:
[ 0.000000] microcode: microcode updated early to revision 0x41c, date =
2022-03-24
[ 0.000000] Linux version 5.19.0-trunk-amd64
(debian-ker...@lists.debian.org) (gcc-11 (Debian 11.3.0-5) 11.3.0, GNU ld (GNU
Binutils for Debian) 2.38.90.20220713) #1 SMP PREEMPT_DYNAMIC Debian
5.19-1~exp1 (20
22-08-02)
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-5.19.0-trunk-amd64
root=UUID=ebbb839d-ba09-4c1a-9fef-e88a4eb2dad5 ro quiet
[…]
[ 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
[…]
[ 1.491029] evm: HMAC attrs: 0x1
[ 1.543661] Freeing unused decrypted memory: 2036K
[ 1.543976] Freeing unused kernel image (initmem) memory: 2728K
[ 1.564222] Write protecting the kernel read-only data: 24576k
[ 1.564898] Freeing unused kernel image (text/rodata gap) memory: 2040K
[ 1.565257] Freeing unused kernel image (rodata/data gap) memory: 1540K
[ 1.572779] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 1.572783] Run /init as init process
[…]
360 ms are considerable part of the whole boot time.
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