Re: performance tuning differences?

[Michael E Brown <michael_e_brown@dell.com>]

On Wed, 15 Aug 2001, mulyadi wrote:

> hello all
>
> >What I found odd was the same exact floating point intensive code compiled
> >and run on the same exact hardware performed 20% WORSE under redhat linux
> >7.1 (20% better using RH 6.2), both straight installs out of the box.

Changes to signal handling in kernel 2.4 have caused some performance loss
on Pentium III+ processors. The kernel now saves and restores the SSE
registers on signals, which incurrs overhead. Congratulations, you have
found the one area in which performance has gone down from 2.2->2.4. This
is due to Intel, though, and not specific to Linux.

--
Michael Brown
Linux OS Development
Dell Computer Corp

  If each of us have one object, and we exchange them,
     then each of us still has one object.
  If each of us have one idea,   and we exchange them,
     then each of us now has two ideas.



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