[PLUG-TALK] Laptop Memory Question
heinlein at madboa.com
Thu Mar 10 16:13:07 PST 2011
On Thu, 10 Mar 2011, Keith Lofstrom wrote:
> The dmidecode utility is cool to learn about. But, when I run it on
> my laptop, it says:
> Physical Memory Array
> Maximum Capacity: 2 GB
> I am currently running with 3 GB. I know the machine won't take 4
> GB. The reported number is the "official" number for a Thinkpad
> T60, which is often lower than what actually works.
I suppose it's like overclocking -- some amount of pushing the
official limits will increase system performance, but there comes a
point where the system can't handle it. :-)
> On the other hand, aren't there are memory limits for 32 bit linux?
> Or at least some magic needed for grub.conf? Any issues with
> suspend, when the RAM gets large?
There are hard per-process memory limits for 32-bit Linux. It used to
be that 32-bit systems were subject to a system limit of 4 GB of RAM,
but CPUs with the 'pae' feature can run PAE kernels (which use mapping
techniques reminiscent of "high" memory in DOS days) to extend that
limit to 64 GB.
Paul Heinlein <> heinlein at madboa.com <> http://www.madboa.com/
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