Re: automatic installation of PAE-enabled kernel?

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On Sat, 19 Jan 2008, John Summerfield wrote:

> Robert P. J. Day wrote:
> > On Sat, 19 Jan 2008, John Summerfield wrote:
> >
> > > Robert P. J. Day wrote:
> > > >   if i had been installing f8 on a 32-bit, PAE-enabled system with >4G
> > > > of RAM, would that have automatically installed the PAE version of the
> > > > kernel?  or would i have had to make a choice along the way?  thanks.

> > > Try on one of those spare laptops:-)

> > you funny man.  :-P actually, it wouldn't help since all of those
> > laptops have 64-bit AMD CPUs so PAE doesn't come into play.
>
> AMD-64 is, I think, a superset of PAE, so PAE would br right if you
> install 32-bit.

right ... i would still need a PAE-enabled kernel even on a 64-bit CPU
if i installed only the 32-bit version of the OS.  is that what you
were saying?  i *believe* that's the case but i haven't tested that
since none of my systems have >4G of RAM.

> > the actual issue is that, if i have a 32-bit, PAE-enabled system
> > with <4G of RAM, obviously, PAE won't be relevant and i'll get a
> > regular kernel installed.  but what if, even though there's <4G
> > *now*, i know that i'll be putting in several gig next week, so
> > i'll want the PAE kernel in preparation for that?  better yet,
> > does it hurt to have a PAE kernel even if you don't need the PAE
> > functionality?
>
> When I replied earlier, I ran dmidecode to see how may RAM slots I
> have. I can install 4 Gbytes, but as I understand things I don't get
> to use it all unless I use PAE. But I could be wrong, I might not
> get to use it all either way.

maybe someone more knowledgeable can clarify this.  and, again, i'm
still unsure if there's any harm in running a PAE-enabled kernel even
when you don't need one.

rday
--

========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

Home page:                                         http://crashcourse.ca
Fedora Cookbook:    http://crashcourse.ca/wiki/index.php/Fedora_Cookbook
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