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SubjectRe: slowdown 2.0.35 vs 2.1.121 (pre 1)
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Andrea Arcangeli <andrea@e-mind.com> writes:


> >So the problem really seems to be link somehow with Pentium PRO and
> >Pentium II processors !
>
> Sound really strange. Can you run the same binary image of the Pentium
> (that works fine) on the PII/PPROs (just to remove all software variables
> from the equation?)?
>
> Andrea[s] Arcangeli

I took the binary compiled on Pentium 100 MHz with gcc 2.7.2 + glibc 1
and I tried it on our IBM dual PPro 200 MHz (256 kb cache): the
problem is still there. The performance loss does not seem to be
linked with gcc/egcs or glibc version. We have reproduced
(unfortunately) the problem with 2 different dual PII systems, single
and dual PPro systems that had a variety of gcc/egcs/glibc versions.

I also disabled the L2 cache to see if that would make any
differences: the system is slower and there is still a performance
loss. So it does not seem linked with L2 cache either.

We will keep investigating, (we should try Andrea profiling test this
afternoon)


Claude

--
Claude Gamache, CAE Electronique Ltee, 8585 Cote-de-Liesse
Saint-Laurent, Quebec, Canada H4T 1G6
Email: cgamache@cae.ca Tel.: (514) 341-2000 x3194

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