On Tue, 3 Oct 2006 12:35:03 +0200
Ingo Molnar <[email protected]> wrote:
>
> add back a mistakenly removed udelay(10) to the PIT initialization
> sequence.
>
> Signed-off-by: Ingo Molnar <[email protected]>
> ---
> arch/i386/kernel/i8253.c | 1 +
> 1 file changed, 1 insertion(+)
>
> Index: linux/arch/i386/kernel/i8253.c
> ===================================================================
> --- linux.orig/arch/i386/kernel/i8253.c
> +++ linux/arch/i386/kernel/i8253.c
> @@ -45,6 +45,7 @@ static void init_pit_timer(enum clock_ev
> outb_p(0x34, PIT_MODE);
> udelay(10);
> outb_p(LATCH & 0xff , PIT_CH0); /* LSB */
> + udelay(10);
> outb(LATCH >> 8 , PIT_CH0); /* MSB */
> break;
>
Doesn't help.
> * Ingo Molnar <[email protected]> wrote:
>
> > yeah, i suspect it works again if you disable:
> >
> > CONFIG_X86_UP_APIC=y
> > CONFIG_X86_UP_IOAPIC=y
> > CONFIG_X86_LOCAL_APIC=y
> > CONFIG_X86_IO_APIC=y
> >
> > as the slowdown has the feeling of a runaway lapic timer irq.
> >
Disabling IO_APIC doesn't fix the slowdown.
Disabling LOCAL_APIC does fix it.
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