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SubjectRe: [patch-mm 21/23] x86-64 block irq balancing for timer
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this isn't needed actually.. the userspace irq balancer won't balance
irq 0 anyway, and if the sysadmin has a REAL good reason to move this
himself... then why shouldn't we let him?



On Sun, 2007-06-10 at 09:44 +0000, Thomas Gleixner wrote:
> plain text document attachment
> (x86-64-clockevents-irq-balancing.patch)
> From: Venki Pallipadi <venkatesh.pallipadi@intel.com>
>
> Disable irq balancing on IRQ0.
>
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Andi Kleen <ak@suse.de>
>
> ---
> arch/x86_64/kernel/time.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux-2.6.22-rc4-mm/arch/x86_64/kernel/time.c
> ===================================================================
> --- linux-2.6.22-rc4-mm.orig/arch/x86_64/kernel/time.c 2007-06-10 10:44:39.000000000 +0200
> +++ linux-2.6.22-rc4-mm/arch/x86_64/kernel/time.c 2007-06-10 10:44:40.000000000 +0200
> @@ -255,7 +255,7 @@ static unsigned int __init tsc_calibrate
>
> static struct irqaction irq0 = {
> .handler = timer_interrupt,
> - .flags = IRQF_DISABLED | IRQF_IRQPOLL,
> + .flags = IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING,
> .mask = CPU_MASK_NONE,
> .name = "timer"
> };

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