Re: [PATCH] - Speed up boot - skip unnecessary clock calibration

From: Jack Steiner <steiner_at_sgi.com>
Date: 2007-03-28 05:22:02
On Tue, Mar 27, 2007 at 12:17:17PM -0700, Yu, Fenghua wrote:
> >+	 */
> >+	if (local_cpu_data->itc_freq != per_cpu(cpu_info, cpuid -
> 1).itc_freq >||
> >+			local_cpu_data->proc_freq != per_cpu(cpu_info,
> cpuid - >1).proc_freq ||
> 
> BSP (cupid=0) should always calibrate delay. Otherwise the patch won't
> work.

True, but the call to calibrate the delay on cpu 0 comes from a different
place. See the call in init/main.c.

The code in smp_callin() is only called for cpus 1, 2, ...


-- jack
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Received on Wed Mar 28 05:22:21 2007

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