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Commit 1ff100d7 authored by John Stultz's avatar John Stultz Committed by Linus Torvalds
Browse files

[PATCH] correct slow acpi_pm rating 



On Bob's machine clocksource is selecting PIT over the ACPI PM timer,
because he has the PIIX4 bug.  That bug drops the ACPI PM timers rating
to the same as the PIT, so that's why you're getting the PIT.

Realistically, the PIT is much slower then even the triple read ACPI PM,
so the de-ranking code is probably dropping it too far.

So don't drop ACPI PM quite so low if we see the PIIX4 bug.

Signed-off-by: default avatarJohn Stultz <johnstul@us.ibm.com>
Cc: Bob Tracy <rct@gherkin.frus.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d340d890

drivers/clocksource/acpi_pm.c

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ __setup("acpi_pm_good", acpi_pm_good_setup); 
static inline void acpi_pm_need_workaround(void)

{

	clocksource_acpi_pm.read = acpi_pm_read_slow;

	clocksource_acpi_pm.rating = 110;

	clocksource_acpi_pm.rating = 120;

}



/*