F9 and move to Hyperthreaded processor

[Jerry Feldman]

On 11/15/2008 06:03 PM, Bob Kinney wrote:
> Hello--
>
> I am running F9 on an older box that has a Pentium 4 non-hyperthreaded 
> processor--it works great.
>
> I want to plop in a hyperthreaded processor--let's assume here that the processor and mainboard are compatible and working fine together.
>
> When I fire this system back up, how will the kernel react?  
>
> I have read that SMP is built into the kernel already, so will it simply
> pick up on the "extra" processor and begin working in hyperthreaded/dual
> processor mode or will this be an OS rebuild event (or something 
> in between)?
>   
Be wary of hyperthreading. AFAIK, Intel no longer supports this feature 
in their processors. First, there are a number of applications that 
actually suffer from hyperthreading. For instance, my company's product 
runs significantly slower on a system with hyperthreading enabled.  So, 
make sure you runs some tests. It was a good idea to extend the old 
single core processors. A colleague of mine also found some bugs in the 
microcode.

-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB  CA3B 4607 4319 537C 5846


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