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Re: [PLUG] Linux on Dual Core
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Hi Stephen:
* Stephen Gran <steve@lobefin.net> [2006-10-20 11:16:15 +0100]:
> On Thu, Oct 19, 2006 at 07:45:22PM -0400, Mark M. Hoffman said:
> > Hello:
> >
> > * Stephen Gran <steve@lobefin.net> [2006-10-19 15:44:52 +0100]:
> > > On Thu, Oct 19, 2006 at 10:20:44AM -0400, Toby DiPasquale said:
> > > > On Thu, Oct 19, 2006 at 02:18:08PM +0000, Jabberwocky wrote:
> > > > > I'm about to purchase a new laptop, and I'm looking at the Intel Dual
> > > > > Core processors. Any gotchas with installing Linux on these chips?
> > > >
> > > > Just one. If you want to use both CPUs, make sure you're using an
> > > > SMP-enabled kernel.
> > >
> > > In >= 2.6.18, there is no longer a difference. SMP is detected at boot
> > > time.
> >
> > Oh yes there is still a difference. Where did you read that?
>
> You no longer need to build different kernels for SMP and non-SMP
> systems. The kernel now detects if it is running on an SMP system or
> not. Of course there are differences.
Well, I did a little more STFW after I replied and I found that it is possible
to configure a kernel that does this. You need to enable CONFIG_HOTPLUG_CPU,
which is non-intuitive, and which still requires CONFIG_SMP to be enabled.
So... Toby's advice is still correct.
BTW: here is an article that describes how this works... interesting stuff.
http://lwn.net/Articles/164121/
Regards,
--
Mark M. Hoffman
mhoffman@lightlink.com
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