Re: [Hampshire] How to tell how much memory?

On 14/07/07, Jonathan Hudson <jh+hlug@???> wrote:
> On Sat, 14 Jul 2007 18:18:37 +0100
> "Victor Churchill" <victorchurchill@???> wrote:
> > But ...
> > memtest says it is testing 768 MB.
> > 'top' says 769500 K.
> > System Monitor 751.5 MB.
> > /proc/meminfo 769500 .
> > dmesg : 762904K/786368K total.
> >
> > All I can think of is that one of my mem sticks is faulty and thinks
> > it is 512 MB, and reports this, but in fact has 'lost' half of it
> > (address line stuck?)
> >

> You have a kernel build with the (old) <1G memory model. In this mode
> Linux does only see 768K.
>
> You need to build the kernel with 1+3 or 2+2 (mapping of VM between
> kernel and user space) or whatever its called.
>
> I expect the hardware is fine.
>
> -jonathan
>

OK ... but rather surprising. This box is running feisty 7.04, and
uname -a gives
2.6.20-16-generic #2 SMP Thu Jun 7 19:00:28 UTC 2007 x86-64 Gnu/Linux

So not an 'old' kernel ... but maybe the default build uses the 'old'
memory model.

Not sure if I'm up for doing a kernel build atm: it's a long time
since I last tried doing that.

Maybe I should look over on Ubuntu Forums to see if there's any info
on getting an install image configured for 1GB+ ... [1]

(And Vic's suggestion supports what you say about the h/w : dmidecode
reports 2*512 MB sticks. Thanks!)

Thanks also Alan for lshw suggestion; that also says I have 2*512MB.

Video GPU is an onboard NVidia GeForce 6100 NForce 405 which Ububtu's
NVidia X Server Settings says has 512 MB so I shouldn't imagine it's
stealing my main memory as well..

[1] might go for a 32-bit distro this time: the current 64-bit system
I am running does not seem to be showing much benefit, and seems a bit
flakey. But that's another thread...