linux-kernel - Re: [patch-mm 21/23] x86-64 block irq balancing for timer

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Date:	Sun, 10 Jun 2007 09:29:20 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [patch-mm 21/23] x86-64 block irq balancing for timer

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@...el.com>
> 
> Disable irq balancing on IRQ0.
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andi Kleen <ak@...e.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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