On Montag, 4. März 2002 18:29:25, Ian Romanick wrote:
> On Mon, Mar 04, 2002 at 06:51:10PM +0100, Dieter Nützel wrote:
> > On Monday, 4. März 2002 16:30:33, Thomas Dodd wrote:
> > > Dieter Nützel wrote:
> > > > On Sonntag, 3. März 2002 18:09:18, Gareth Hughes wrote:
> > > >> Dieter Nützel wrote:
> > >
> > > >> > CDEBUGFLAGS = -O -mcpu=k6 -pipe -mpreferred-stack-boundary=2
> > > >> > -malign-functions=4 -fschedule -insns2 -fexpensive-optimizations
> > > >>
> > > >> Hmmm, I'm not really sure that's legal (in terms of having reportable
> > > >> results with a binary compiled like that) :-)
> > > > 
> > > > He asked about self compiling...;-)))
> > >
> > > Are these with the default CFLAGS or the K7 optimized?
> > 
> > My K7. I found them during "heavy" Mesa testing since 26. August
> > 1999...;-)
> > Running all Linux kernels with them.
>
> If you're using a fairly recent version of GCC, you can skip most of that
> and just do '-march=athlon'.

Sorry, my apologies.
It is _NOT_.

> I would recommend something like:
>
> CFLAGS = -O2 -march=athlon -pipe
>
> Your best bet for keeping up to date with stuff like this is to periodically
> look at the kernel makefiles. :)

Your best bet is doing it your self and _TEST_.
I did that. The latest was with gcc-3.0.1 CVS and it is slower.
Gcc-3.1.x should deliver some speedup (catch up) but I haven't tested it, yet.

Especially -mcpu=k6 and only -O (nothing) is needed. 
-mpreferred-stack-boundary=2 is second one.

<flamewar mode>
Wouldn't IBM sell some Athlon MP systems?
Where are they?
</flamewar mode>

-Dieter

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