Re: [PATCH] preset loops_per_jiffy for faster booting
From: Adam Kropelin (akropel1_at_rochester.rr.com)
Date: 07/10/04
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To: "Dmitry Torokhov" <dtor_core@ameritech.net>, <linux-kernel@vger.kernel.org> Date: Sat, 10 Jul 2004 16:14:22 -0400
Dmitry Torokhov wrote:
> On Saturday 10 July 2004 01:28 pm, Adam Kropelin wrote:
>> + Note that on SMP systems the preset will be applied to all CPUs
>> + which will cause problems if for some reason your CPUs need
>> + significantly divergent settings.
>> +
>> + If unsure, set this to 0. An incorrect value will cause delays in
>> + the kernel to be wrong, leading to unpredictable I/O errors and
>> + other breakage. Although unlikely, in the extreme case this might
>> + damage your hardware.
>
> Note that it may also not work correctly on laptops that switch
> frequency when working on battery/AC. Also one needs to be careful
> when changing timesource (pit, tsc, pm, hpet). And always look out
> for timer code changes in next version of kernel.
Certainly many demons lurk around the corner, but embedded guys are used to
that.
> Does 250 ms worth all this pain?
On a desktop box, almost certainly not. On a massive SMP machine, maybe. On
an embedded system that is required to boot in a ridiculously short time,
absolutely.
--Adam
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- Previous message: Jean-Christophe Dubois: "Re: [PATCH] Fix building on Solaris (and don't break Cygwin)"
- In reply to: Dmitry Torokhov: "Re: [PATCH] preset loops_per_jiffy for faster booting"
- Next in thread: Andrew Morton: "Re: [PATCH] preset loops_per_jiffy for faster booting"
- Reply: Andrew Morton: "Re: [PATCH] preset loops_per_jiffy for faster booting"
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