Messages in this thread | | | Date | Fri, 29 Oct 1999 17:15:10 +0200 | From | Harald Koenig <> | Subject | Re: Wrong bogomips after plugging in AC power |
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On Oct 29, Pavel Machek wrote:
> Hi! > > So I've now confirmed that my toshiba can speed-up its cpu under some > circumstances. When it is powered up while batteries are low (<20% > will work), it will start with cpu at 150MHz, and bogomips are > computed accordingly.
at least for the Tecra 750/780 you can cycle though these 3 power modi (fast/economy/user settings) using Fn-F2.
> If I plug it into AC power, it will speed up to 300MHz, but bogomips > still have "slow" value. Therefore all udelays are wrong by factor of > two -- udelay(50) will only wait approx. 25usec. That seems pretty
or 100 usec if you boot in fast mode and later switch to slow mode...
> dangerous to me. Maybe we need some other source of short loops?
would be `nice to have';) but how/when do check/realize that you have to recalibrate your delay loop ? all real time clock sources are pretty slow/bad and have slow access, and most likely rdtsc will be clocked down too:(
Harald -- All SCSI disks will from now on ___ _____ be required to send an email notice 0--,| /OOOOOOO\ 24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\ \ \/OOOOOOOOOOOOOOO\ \ OOOOOOOOOOOOOOOOO|// Harald Koenig, \/\/\/\/\/\/\/\/\/ Inst.f.Theoret.Astrophysik // / \\ \ koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
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