Re: [Syllable-kernel] new scheduler and HyperThreading (was Re: dos2unix)

[Daniel G. <da...@fp...>]

On Mon, 2005-01-31 at 19:11 -0800, Jake Hamby wrote:
> Daniel Gryniewicz wrote:
> > 
> > I can easily sync up and give you a new sched02 patch.  I'll do that.
> > Note that, after updating CVS today, I'm having tons on warnings on my
> > linux box.  These will likely show up with Vanders' experimental GCC, so
> > we should probably fix those too.  (The <atheos/typedefs.h> ->
> > "inc/typedefs.h" move had me fooled for a minute...)
> 
> Cool.  I'll test Vanders' new GCC and see how stable it is for kernel 
> builds.  I've been reading _The Unabridged Pentium 4 IA32 Processor 
> Genealogy_ at Safari.oreilly.com and I found some good tips on getting 
> the best performance with HT.  Are you keeping in mind the differences 
> between logical and physical CPUs in your scheduling logic?  Here are 
> the techniques that Intel recommends to optimize performance for 
> HT-enabled processors.
> 

<snip HT stuff>

Yep, I'm keeping all that in mind.  HT is quite important to something
like Syllable.  The goal is to optimize for the 2 physical (and possibly
4 logical) CPU case, for now, at least until dual-CPU-dual-core systems
become common.

Daniel

PS I sent the patch, but I keep forgetting the 40kb limit on the list,
so it's in moderation again. <sigh>  Next time, I'll CC you directly.