Hello.
This is a strange problem I have.
My computer has 4GB installed but for some reason I could only see the 2 of the 4.
At first I thought that this was because the XEN virtual operating system manager was running but even after I turned it off the problem exists. I could only see and use the 2GB of memory.
alaios wrote:
> My computer has 4GB installed but for some reason I could only see the
> 2 of the 4.
actually, it is not so strange…there are (probably) 25 or 50 (or
650) threads in these fora asking pretty much this same question, and
the answers are all pretty much the same:
some motherboards can only support 2 GB of ram, but you can put a
lot more than that in, just can’t “see” it…
some motherboards were born with a BIOS which only supports 2GB, but
there may be a newer BIOS which supports more…
some kernels only support 2GB and 32 bit processors…but, there is
also a “pae” kernel which supports more RAM…
if you installed a 32 bit system with the default or desktop kernel
you will be stuck at 2GB until you install the pae kernel if the
motherboard actually supports more than 2GB RAM
use the forums advanced search engine or google with the site
specifier
The first thing you should try is to take a look at the BIOS information. Does it report 2 or 4GB installed? If it’s 2GB, then there are three possibilities:
-The RAM isn’t installed correctly (or you don’t have as much as you think you do).
-The motherboard needs a firmware update.
-You need a new motherboard.
If the BIOS shows 4GB, then try a “more /proc/version” and see if the kernel version has “-pae” appended to it. If it doesn’t, try “yast -i kernel-pae” to install the PAE kernel. Reboot and see if that helps.
Thanks for your replies.
It seems that I didn’t explain my problem very well.
When my linux boots always depicts the right amount of memory (4 GB). When I launch (using Xen virtual manager) windows 7, 1 gb of memory is reserved in advance for windows 7 and thus linux depicts 3gb of memory.
The problem is that when I close (turn off) windows 7 the 1gb reserved memory doesnt return back to the native linux host (domain-0 called in xen). Even though when I close the virtual manager still this 1Gb memory is lost.
So I have the following two questions
a) Is it possible somehow to make XEN to make dynamic memory allocation. Even though that windows 7 uses usually up to 600MB of memory always 1Gb is statically reserved (ofc it is configured for that).
b) Why my memory does not return back to the operating system even though when my XEN (and guest operating system) is shut down?
alaios wrote:
> a) Is it possible somehow to make XEN to make dynamic memory
> allocation. Even though that windows 7 uses usually up to 600MB of
> memory always 1Gb is statically reserved (ofc it is configured for
> that).
>
> b) Why my memory does not return back to the operating system even
> though when my XEN (and guest operating system) is shut down?
great questions…but it has nothing to do with openSUSE…
so, great questions for a XEN guru…
one here (if there are any) might find your Q, if you wait long enough…
Thanks for the output. I have to use windows 7 for the Microsoft office. I posted here as I though that XEN is an opensuse technology sorry for the inconvenience.
sorry for the inconvenience.