[sf-lug] 32bit VS 64bit

Kristian Erik Hermansen kristian.hermansen at gmail.com
Thu Oct 18 14:42:36 PDT 2007

For the F1 issue it is my assumption that you have the bios option set
to 'halt on keyboard errors'.  Does that sound right?  Or are you
seeing this message come from grub or the ubuntu kernel?

On 10/18/07, Tom Haddon <tom at greenleaftech.net> wrote:
> On Thu, 2007-10-18 at 09:59 -0700, Ernest de Leon wrote:
> > You will be missing out on the use of some of the RAM.  Run 'top' from
> > the terminal to see how much RAM you system 'sees.'  This will show
> > you that you are not using all 4096 MB of RAM.  The reason is that the
> > 32 bit address space is not wide enough to address all of the RAM.  In
> > addition, every device on the PCI bus takes more addressing space away
> > from that.  Realistically, most people with 4GB of RAM in a 32 bit OS
> > only see 3.25 to 3.5 GB of usable RAM.
> I just installed Ubuntu Gutsy (Server Edition) i386 on a Compaq Proliant
> DL580 server with 12GB RAM. It's got quad 700MHz PIII Xeons, so amd64
> wasn't an option. "top" reveals 12217548k of RAM.... I did some research
> and this seems to explain some of it:
> http://www.spack.org/wiki/LinuxRamLimits
> Basically, the limit seems to be per process, not for the entire OS.
> On a related subject, I'm getting a message when I boot this server for
> F1 to continue, F10 to enter System Partition Utilities. If I try the
> latter it says they aren't installed, and it requires me to choose one
> before proceeding (so basically you couldn't do unattended
> reboots/startups). Anyone have any insight as to what's going on here?
> This is on the server that Andy Grimm donated for future SF-LUG
> projects, so any help appreciated.
> Thanks, Tom
> --
> ----------------------------------
> Tom Haddon
> mailto:tom at greenleaftech.net
> m +1.415.830.6822
> www.greenleaftech.net
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Kristian Erik Hermansen

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