Re: Choosing a HyperThreading/SMP/MultiCore kernel ?

[Valdis.Kletnieks@vt.edu]

On Sat, 13 Jan 2007 12:54:43 EST, Lennart Sorensen said:
> On Fri, Jan 12, 2007 at 10:38:43PM -0500, Valdis.Kletnieks@vt.edu wrote:
> > CONFIG_MCORE2=y
> 
> Oh good.  Makes life much simpler for users.

After writing that, I actually went back and *checked* the fine print.
It turns out that unless you have installed a not-yet-escaped release of
gcc, -mtune=core2 doesn't work, so it punts to -mtune=generic.  Wandering
over to http://gcc.gnu.org and searching the mailing lists, it seems that
on most of the benchmarks, -mtune=core2 was only a 0.5% or so win on most
stuff in its current form.

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