http://bugzilla.kernel.org/show_bug.cgi?id=14669
Summary: Operation “PM: Adding info for pci” slows down boot
process
Product: ACPI
Version: 2.5
Kernel Version: >=2.6.29
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=23878)
--> (http://bugzilla.kernel.org/attachment.cgi?id=23878)
Output of acpidump
Hi all, I have a nuisance with booting ACPI-enabled kernels on my notebook.
Since I don’t know much about kernel operation, all I can do is show you the
issue I’m talking about:
[ 0.552322] ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCIB._PRT]
[ 0.753070] PM: Adding info for pci:0000:00:00.0
...
[ 4.372027] PM: Adding info for No Bus:0000:0f
[ 4.372115] ACPI: PCI Interrupt Link [LNKA] (IRQs 10 *11)
I get 30 “PM: Adding info...” messages, and as you can see in this dmesg
excerpt, they take up a considerable amount of time (about 3.6 seconds, that’s
a lot compared to the full kernel boot, which takes about 7.8 seconds). Compare
to my old Athlon XP, which boots the same kernel version in 2.8 seconds.
Also, the reason I consider this a bug is that the screen stays black until
after the last of those “PM: ...” messages. In order to understand what was
going on, I had to check out dmesg, and recompile enabling “Verbose Power
Management debugging”; I figured that would help, since the black-out happened
between the two “ACPI: PCI Interrupt” messages.
Configuration information:
I’m currently running kernel 2.6.30 with the Gentoo patch set
(2.6.30-gentoo-r8, latest stable), but I got the same results with a few stock
kernels, versions ranging from 2.6.29.6 to 2.6.31.6 (latest stable).
I tried each kernel using both a very customized config file (tailored for my
computer) and the default config file, only adding necessary drivers. In both
cases, I get the same delay. This was mostly to rule out the impression I have
I misconfigured my kernel at some point.
I use no initramd/initrd.
If relevant, the customized config file comes from a customization process that
resulted in no modules being necessary upon boot. Every module that would be
loaded during the boot process, I embedded in the kernel; drivers/features that
are loaded on demand, I compiled as modules.
System information:
The computer is an Acer Extensa 5620 with Intel i965GM-E and Core 2 Duo T5550;
I once updated the BIOS (before switching to Linux), but I haven’t checked in
about 8 months for further updates. I can do that if necessary.
Further information:
Please notice I don’t experience this delay with any other Linux system, either
real (my old Athlon XP on nForce2 400 Ultra and my gf’s Turion 64 notebook) or
virtualized.
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