Re: R4400 vs R5k ?

[Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>]

Mika Valtonen wrote:
> > > I was wondering about the performance of these two machines:
> > > 1.) Indy R4400 200MHz 1MB cache
> > > 2.) Indy R5000 180MHz 0,5MB cache,
> > > both running linux.
> > > 
> > > I think the R5k must be much faster in floating point, but what about
> > > integer performance ?
> > 
> > Well, BogoMips claims 0.5 * MHz for R4400 and 1.0 * MHz for R5000.
> > Real-World applications will be most likely somewhat faster on the
> > R5000, but not as much as the BogoMips value suggests.
> 
> But isn't there a problem with cache consistency on the R4400, forcing linux
> to do lots of cache flushes on an R4400 that are not necessary on an R5k !?

It used to be worse than it is in the current (2.4.25) kernel now.
If they actually have an influence on your application depends
on the access pattern.


Thiemo