[GRLUG] Pentium 4 and Gentoo Linux?

[Zetaphor .]

I'm just going to leave this here :-)

http://funroll-loops.info/


On Thu, Jun 20, 2013 at 4:05 AM, Greg Folkert <greg at gregfolkert.net> wrote:

> On Wed, 2013-06-19 at 22:52 -0400, Kyle wrote:
> > On 06/19/2013 08:44 PM, Adam Tauno Williams wrote:
> > > On Wed, 2013-06-19 at 18:11 -0500, Philip Robar wrote:
> > >> I’m hoping that someone, like Mike Mol - our resident Gentoo advocate,
> > >> might know the answer to this (and save me hours of experimenting):
> > >> Will compiling Gentoo specifically for Intel P4/Netburst with GCC,
> > >> Intel or LLVM make a noticeable difference on a general purpose
> > >> desktop as opposed to using a generically compiled distribution?
> > > I know next to nothing about Gentoo... but I'd be willing to wager
> lunch
> > > that the answer is "No way, no difference".  I've seen more bugs
> > > introduced by eager-to-optimize setups than I have performance
> > > improvements.  Compiler optimization performance improvements are
> pretty
> > > much limited to code written specifically to demonstrate they make
> > > things go faster.
> > >
> > > Note that you said ****"difference on a general purpose desktop"***.
> > > Special cases, especially those involved math / real-data-processing
> > > might be different, but a "general purpose desktop"... no way, no
> > > difference.  You're more likely to break something.
> > >
> > > [snip]
> >
> >
> > Can't answer for Netburst, either, but I can say that I run Gentoo and
> > haven't seen much of a change in performance with compiling specifically
> > for my CPU (an i7) over a generic x86_64 build.  However, Gentoo lets
> > you compile out all kinds of junk you don't want or use by changing your
> > USE flags, and that, for me anyway, makes a significant difference in
> > speed and power consumption vs. a generic "cram every feature in, just
> > in case it's ever needed" build.
>
> Perception is 90% of the perceived benefit.
>
> --
> greg at gregfolkert.net
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> can achieve them."
>     -- Herbert Read
>
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