Messages in this thread | | | Date | Thu, 20 Jul 2000 05:14:51 -0700 | From | Philipp Rumpf <> | Subject | Re: BogoMIPS and changed CPU speed |
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On Thu, Jul 20, 2000 at 12:08:48PM +0000, Erik Mouw wrote: > On Wed, 19 Jul 2000 16:39:06 +0200, David Balazic wrote: > > As I understand the BogoMIPS value is used for some fine grained > > delays. How does then the system survive a big change in the processor > > speed when : > > > > - user changes FSB on the fly ( possible with newer mainboards, > > I never tried it though ) > > - CPU goes to lower clock due to power management > > - user (de)activates TURBO on older x86 computers > > The system survives the speed change very well. I've done clock scaling on > StrongARM SA1100 CPUs (see signature), and I could change the clock speed > from 59 to 265 MHz without problems. The proper implementation should
Depends on the drivers you're using - one of the SCSI drivers failed to work properly on certain alphas were udelay()'s speed varied by a factor of 2 depending on the next instruction after the udelay assembly (this has been fixed now).
Fixing loops_per_sec to the highest possible value should always work though.
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