Messages in this thread Patch in this message | | | Date | Tue, 3 Oct 2006 12:35:03 +0200 | From | Ingo Molnar <> | Subject | [patch] clockevents: drivers for i386, fix #2 |
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* Ingo Molnar <mingo@elte.hu> 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. > > from code review so far we can only see an udelay(10) difference in > the initialization sequence of the PIT - we'll send a fix for that but > i dont think that's the cause of the bug.
the patch below fixes that particular bug. But ... the symptoms you are describing have the feeling of being apic related.
Ingo
--------------------> Subject: clockevents: drivers for i386, fix #2 From: Ingo Molnar <mingo@elte.hu>
add back a mistakenly removed udelay(10) to the PIT initialization sequence.
Signed-off-by: Ingo Molnar <mingo@elte.hu> --- 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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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