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Old 11-24-2011, 12:22 PM   #1
roopakl
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Memory details for only one RAM


Hi..Masters,
I have a core i3 PC, which had only 2GB RAM earlier. Today I bought a 4GB RAM and installed in the PC. But now it showing only 3.2*GB RAM in the O/S, which means about only 4GB and not showing about 2GB RAM when I ran "free -m" command.
I checked in the BIOS and found it is showing about both and showing total memory as 6GB. I am using ubuntu 11.04.
Should I reinstall the O/S to brings up the RAM capacity to 6GB?
I also checked it with "cat /proc/meminfo" command and found MemTotal for only 3.2 something GB. Why it is not showing completely 4GB and why it is not showing other one i.e 2GB?
The swap was not given double of the RAM(4GB) while installing O/S and I had given 10GB as swap even I had only 2GB at that time. So the swap is making anything wrong?
Please help me, how to brings up the total memory as 6GB without reinstalling the O/S.

Last edited by roopakl; 11-24-2011 at 12:24 PM. Reason: correction
 
Old 11-24-2011, 12:34 PM   #2
ukiuki
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Ubuntu 32bits will not show more than that I'm not sure how to work around with it besides recompile a custom kernel so you activate 'High Memory Support', now if you don't want go through that, then just install the 64bit version and it will read all your RAM.

Regards
 
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Old 11-24-2011, 12:39 PM   #3
rahulkya
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you can do one more thing ....search for
Quote:
linux-kernel 2.6.*.*-generic-pae
in package manager if possible in synaptic...then mark it and install it .....
PAE stand for physical-address-extension......
This should work let's hope you don't have to install 64bit version....
 
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Old 11-24-2011, 09:15 PM   #4
chrism01
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Actually, 64bit is better; PAE is just a kludge for 32bit OSes.
 
Old 11-24-2011, 09:39 PM   #5
roopakl
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Code:
then just install the 64bit version and it will read all your RAM.
Thanks for your kind reply.
Is it possible to install 64bit O/S using "apt-get install" command without affecting my existing data and the servers(squid proxy, dns, dhcp etc), if yes, could you please show me the full command with 64bit name to install it. Because I dont want to go with a fresh install and reinstall/reconfigure all other.

Last edited by roopakl; 11-24-2011 at 09:43 PM. Reason: correction
 
Old 11-24-2011, 09:51 PM   #6
roopakl
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Code:
PAE stand for physical-address-extension......
This should work let's hope you don't have to install 64bit version
Thanks for your kind reply.
There are many, but I didn't find that which line is having word called kernel and the package name for headers and confused in which one I have to. So please find the package manager snapshots and let me know that which are the packages I should install.
Attached Thumbnails
Click image for larger version

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Name:	pae2.png
Views:	5
Size:	144.8 KB
ID:	8476  
 
Old 11-24-2011, 09:56 PM   #7
Roken
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Based on your screenshot you want to install
linux-image-2.6.38-11-generic.pae and the matching linux-headers package.
 
Old 11-24-2011, 11:01 PM   #8
ukiuki
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If u use synaptic (menu System>Administration>Synaptic) you have there a search tool where u can type key words to find the package your looking for. Example: Linux image pae

to know which kernel your machine is running type in the terminal:
Code:
uname -r
To install a 64bit system, well that means you have to reinstall the whole system.
For that you need the 64bit installation cd.

Regards

Last edited by ukiuki; 11-24-2011 at 11:02 PM. Reason: typo
 
Old 11-25-2011, 01:57 AM   #9
rahulkya
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after installing pae kernel you may be end up with more options at the boot menu{grub menu}..No need to worry.
then choose PAE version at boot time for make your RAM working...
 
  


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