Re: Long timeout when booting >= 2.6.38
From: Christian Hoffmann
Date: Wed May 04 2011 - 15:40:23 EST
Hmm. So I really wonder why it refuses to switch to acpi_pm when you
select it on the kernel command line.
Does "echo acpi_pm> /sys/devices/system/clocksource/clocksource0/current_clocksource"
work ?
Yes, that seems to work:
root@c3po:~# echo acpi_pm >
/sys/devices/system/clocksource/clocksource0/current_clocksource
root@c3po:~# dmesg | grep clocksource
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch+
root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
[ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch+
root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
[ 1.463754] Switching to clocksource tsc
[ 1.470700] Override clocksource acpi_pm is not HRT compatible.
Cannot switch while in HRT/NOHZ mode
[ 125.808622] Switching to clocksource acpi_pm
Ok. That excludes HPET. So the only difference left is the late
registration of TSC which happens _AFTER_ the hang.
Can you boot the non working kernel with "lpj=28098860" on the kernel
command line ?
The dmesg output with lpj is here (and it still hangs):
http://pastebin.com/raw.php?i=wZWrbc7Z
Kind regards,
Chris
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