Re: [Celinux-dev] Re: [PATCH] preset loops_per_jiffy for faster booting

[Adam Kropelin]

On Sat, Jul 10, 2004 at 04:41:04PM +0200, Geert Uytterhoeven wrote:
> On Fri, 9 Jul 2004, Adam Kropelin wrote:
> > On Fri, Jul 09, 2004 at 05:20:07PM -0700, Tim Bird wrote:
> > > Adam Kropelin wrote:
> > +		printk("Set 'Preset loops_per_jiffy'=%lu for preset lpj.\n",
> > +			loops_per_jiffy);
> 
> > +config PRESET_LPJ
> > +	int "Preset loops_per_jiffy" if FASTBOOT
> > +	default 0
> > +	help
> > +	  This is the number of loops used by delay() to achieve a single
> > +	  jiffy of delay inside the kernel.  It is normally calculated at
> > +	  boot time, but that calculation can take up to 250 ms per CPU.
> > +	  Specifying a constant value here will eliminate that delay.
> > +
> > +	  loops_per_jiffy is roughly BogoMips * 5000. To determine the correct
> > +	  value for your kernel, first turn off the fast booting option,
>                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > +	  compile and boot the kernel on your target hardware, then see what
> > +	  value is printed during the kernel boot.  Use that value here.
> 
> This is no longer true, it will always print the value if lpj=0.

True enough. I'll fix that along with the things Todd noticed.

--Adam

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