[CentOS] Kernel ELsmp vs EL

Sebastien Tremblay sebastien.tremblay at au.cmpmedica.com
Fri Sep 8 00:09:05 UTC 2006

> On 07/09/06, Jim Perrin <jperrin at gmail.com> wrote:
> > On 9/6/06, Sebastien Tremblay <sebastien.tremblay at au.cmpmedica.com>
> > > Hi all,
> > >
> > > I'm not very used to CentOS and Linux generally speaking, though I

> > > read a lot and 'man' quickly became a very good friend of mine, 
> > > right after Google, so sorry if that's a ridiculous one! (at least

> > > it'll give you a good laugh!)
> > >
> > > I updated the kernel to 2.6.9-42.0.2 recently and that raised a 
> > > question... Simple... Yet silly...! What exactly is the difference

> > > between 2.6.9-42.0.2EL and 2.6.9-42.0.2ELsmp? It seems the default

> > > install was the 'smp' kernel, but as I had to change the grub
> > > I stumbled across this one and... started wondering...
> >
> > SMP is for dual processor (or dual core) systems. The default EL 
> > kernel is for a single processor system, but is installed as a 
> > failsafe kernel on smp systems "just in case".
> >
> AFAIK running smp kernel on a single core machine with hyper threading
switched on is also good idea.

Awesome... Next server has HT.. So I'll give that a try!

Cheers for your time!


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