http://bugzilla.kernel.org/show_bug.cgi?id=13087
--- Comment #6 from alexs <alex....@intel.com> 2009-04-15 02:17:59 ---
(In reply to comment #5)
> (In reply to comment #4)
> > How about adding the boot option of "notsc"?
>
> Might try it, but from the log it looks like the TSC is already being thrown
> out, so I suspect its the acpi_pm timer stalling in higher C states.
Does you meaning the acpi_pm timer can save the box from TSC issue which make
box hang?
John:
the main contents of bad commit is quite simple as below, would you like to add
some debug printk to check the kt2/kt1's value?
- t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt1 = ktime_get_real();
acpi_idle_do_entry(cx);
- t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ kt2 = ktime_get_real();
+ idle_time = ktime_to_us(ktime_sub(kt2, kt1));
local_irq_enable();
cx->usage++;
- return ticks_elapsed_in_us(t1, t2);
+ return idle_time;
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