Subject: Re: [PATCH] pseries: cpu: Reduce the polling interval in __cpu_up()

From: Joel Schopp <[email-masked]>
Date: Wed, 24 Jun 2009 11:39:09 -0500

>
> The code needs testing on other powerpc platforms.
>   
I think given the numbers you showed this is a good improvement, and it 
clearly can't do any harm on platforms that implement msleep correctly.

For what it's worth:
Acked-by: Joel Schopp <[email-masked]>
> Signed-off-by: Gautham R Shenoy <[email-masked]>
> ---
>  arch/powerpc/kernel/smp.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 65484b2..00c13a1 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -411,9 +411,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
>  		 * CPUs can take much longer to come up in the
>  		 * hotplug case.  Wait five seconds.
>  		 */
> -		for (c = 25; c && !cpu_callin_map[cpu]; c--) {
> -			msleep(200);
> -		}
> +		for (c = 5000; c && !cpu_callin_map[cpu]; c--)
> +			msleep(1);
>  #endif
>  
>  	if (!cpu_callin_map[cpu]) {
>
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