From: Jack Steiner <steiner@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] - Speed up boot - skip unnecessary clock calibration
Date: Tue, 27 Mar 2007 19:22:02 +0000 [thread overview]
Message-ID: <20070327192202.GA29785@sgi.com> (raw)
In-Reply-To: <20070327132953.GA14401@sgi.com>
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
next prev parent reply other threads:[~2007-03-27 19:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-27 13:29 [PATCH] - Speed up boot - skip unnecessary clock calibration Jack Steiner
2007-03-27 17:53 ` Matthew Wilcox
2007-03-27 18:42 ` Luck, Tony
2007-03-27 19:17 ` Yu, Fenghua
2007-03-27 19:22 ` Jack Steiner [this message]
2007-03-27 19:30 ` Jack Steiner
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