Re: How is user space notified of CPU speed changes?

[Andreas Dilger]

On Oct 22, 2004  14:05 -0400, Lee Revell wrote:
> On Fri, 2004-10-22 at 07:23, Alan Cox wrote:
> > No it did not. It has never been a safe assumption. Even my old PC110
> > does APM non-linux assisted shifts between 8 16 and 33Mhz. In addition
> > there are boxes with dual CPU's and different multipliers - dual 
> > 300/450's were not uncommon.
> > 
> > And thats before we even mention such things at hyped-threading.
> 
> Seems like you are implying that any userspace app that needs to know
> the CPU speed is broken.  Is this correct?

Sadly, if I boot my laptop on battery and then plug it in, all of my
MP3s run twice (or whatever) as fast (XMMS on 2.4), making them sound like
the Chipmunks on crack.  I have to reboot my system while plugged in
to listen to music.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://members.shaw.ca/adilger/             http://members.shaw.ca/golinux/

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