Re: CPU/cache detection wrong

[Vojtech Pavlik <vojtech@suse.cz>]

On Tue, Oct 01, 2002 at 05:31:07PM +0200, Alexander Hoogerhuis wrote:
> Dave Jones <davej@codemonkey.org.uk> writes:
> 
> > On Tue, Oct 01, 2002 at 09:21:26AM +0200, Alexander Hoogerhuis wrote:
> >  > Here we go:
> >  > 
> >  > CPU: Trace cache: 12K uops, L1 D cache: 8K
> >  > CPU: L2 cache: 512K
> >  > 
> >  > But my BIOS still say I should have 8Kb/8Kb I/D L1 cache... oh
> >  > well. I'm sure Alan Cox would just write it up as marketing, since
> >  > thats about how reliable a BIOS is :)
> > 
> > Hmm, can a P4 have a trace cache AND an L1 I cache ?
> > I thought they were exclusive, which is why the code
> > doesn't take this into account. Easily fixed if so though..
> > 
> 
> I don't know the gory details of it, but my BIOS claims I got 8/8, but
> I'm deep enough in it now to start taking the 5th amendment on the
> details here :)

12k of trace cache and 8k of I-cache are more or less equivalent - trace
cache is less effective because it has decoded uops, while i-cache has
encoded instructions, which take up less space.

-- 
Vojtech Pavlik
SuSE Labs