[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: CPU Frequency -- min save value?



On Mon, 2005-03-28 at 23:16 +0930, John Steele Scott wrote:
> 
> Aye, this is correct, but it is also true that most of these chips
> have a
> feature called instruction cache throttling. When this is enabled, you
> can
> achieve effective frequencies as low as slow_freq/N, where N is
> between 2 and
> 256. The CPU is still clocked at the same frequency, but the
> instruction cache
> only gives a real instruction every Nth clock cycle. The rest of the
> time the
> CPU is executing NOPs, so many of the functional units will be powered
> down.

So how advanced is the gnu-linux implementation of this considering that
I've heard of an ibook or powerbook coming close to the 5/6 hours OS X
claims (not that apple's claims are believable but still a lot better
htan my brother's pc laptop).  I haven't fiddled around much with the
power saving settings on my ibook with debian but I can tell you I get
about 2 hours of use as is.  This is not impressive.



Reply to: