Messages in this thread | | | From | "Adam Kropelin" <> | Subject | Re: [PATCH] preset loops_per_jiffy for faster booting | Date | Sat, 10 Jul 2004 16:14:22 -0400 |
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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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