[parisc-linux] Linux/PA-RISC speed (was Re: C240 Graphics, 64bit kernel and more)

Grant Grundler grundler@puffin.external.hp.com
Fri, 16 Nov 2001 00:00:16 -0700

Jurriaan on Alpha wrote:
> The results are shocking; the C200+ is twice as slow, and uses 3 times as
> much system time.

I'm not surprised by the result.
1) We've done nearly zero tuning kernel.  Alpha port is much more mature.
2) gcc is poorly tuned for hppa as well.
   ie compare perf of gcc vs acc on HPUX. Up to 2x difference in some cases.
3) gcc is int intensive. Ie clock speed matters more and the alpha
   has 2.5x advantage here.