Comments on: Ubuntu 4GB Ram Limitation and Solution

By: Tornike

Tornike — Tue, 22 Nov 2011 18:18:37 +0000

I followed the second option, but after the ‘free -m’ command I still get 3GBs of RAM in the list of results while I have 4 installed. The ‘apt-get install linux-restricted-modules-server’ command listed the following:

‘Building dependency tree
Reading state information… Done
E: Unable to locate package linux-restricted-modules-server’

I read some advice regarding restricted packages in comments above – is this related to that and what exactly should I do?

Thanks in advance

By: Alex

Alex — Thu, 17 Nov 2011 18:44:41 +0000

That’s great! Thanks a lot!!

By: gilles

gilles — Wed, 09 Nov 2011 11:24:50 +0000

It works like a charm for me.

By: gecko

gecko — Tue, 04 Oct 2011 14:07:52 +0000

Thank you very much!!!
Followed the 2nd option…
On Ubuntu 11.04
intel 920
Asus P6T
OCZ 3G1600LV DDR3

total used free shared buffers cached
Mem: 6033 1059 4974 0 202 395

Thanx mate!

By: grillermo

grillermo — Sat, 03 Sep 2011 18:47:37 +0000

Worked great for me on my Asus N61jQ i got that extra gb of ram and had absolutely no video problems at all.

By: Prashanth

Prashanth — Mon, 29 Aug 2011 10:19:37 +0000

I’m interested to get some more details of your Ubuntu 11.10 experience. Which of the 2 solutions did you use (64 bit or PAE)? Did you use Xubuntu? How much RAM on your system?

Thanks.

By: R Shewade

R Shewade — Sat, 13 Aug 2011 11:14:37 +0000

This is really cool and works fine on Ubuntu 11.10 as well

By: Karim Moussa

Karim Moussa — Mon, 01 Aug 2011 15:15:28 +0000

Have you already activated “memory hole remapping” (or something) in your BIOS? The BIOS itself sees all the 8 GiB, but for the OS to see everything the remaining memory must be mapped above the PCI memory hole. Apart from that, I don’t see why an amd64 OS version wouldn’t address memory the BIOS does.

By: Arun Gandhi

Arun Gandhi — Fri, 29 Jul 2011 15:18:50 +0000

I am using a physical machine for server
Configs are
Core2Duo E 4400 2.Ghz (EM64T capable)
4x2GB DDR2 667 Mhz RAM in Dual Channel
in my BIOS it shows total RAM as 8096 MB
and i Did download Ubuntu server 10.04.3 64 Bit for AMD 64 platform(which has support for xeon core2Duos and core2Quads etc)
and installed it .
when i type in terminal ” free -m ” to check the ram it shows as 3216 GB

and for cpu info when i typed this ” grep flags /proc/cpuinfo ” i got the following flags

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm

also this command clearly verifies that my CPU suuports PAE
”
grep –color=always -i PAE /proc/cpuinfo”

CPU Modes:( Source Ubuntu Forums )

lm flag means Long mode cpu – 64 bit CPU
Real mode 16 bit CPU
Protected Mode is 32-bit CPU

And after 10.04 LTS server edition 64 bit i tried 11.04 64 bit server edition still am facing the same problem just 3.2 gb ram is visible with ” free -m ”
when using ” dmidecode | grep Size | grep MB ”
it shows 4 x 2 GB modules connected to the system ..
please help me with this :S

By: Karim M

Karim M — Wed, 27 Jul 2011 12:26:57 +0000

I would like to add that using the 32-bit version means your software is not able to use the additional CPU registers of the AMD64 architecture.
Plus, if you use PAE, your system will have a 36-bit address space (up to 64 GiB), but each individual process will still have only a 32-bit address space (i.e. will only address 4 GiB).

By: rider on the road

rider on the road — Sat, 21 May 2011 11:55:45 +0000

just installed 11.04 32 bit on my vaio f13z.. without any problem. Suggestion above rised my RAM to 8GB. I hope there will be a ia64 version of 11.04..

By: Christopher Welle

Christopher Welle — Tue, 10 May 2011 01:26:03 +0000

Does not work with Ubuntu 11.04 64bit. No PAE kernel’s are available for this version at the time of this comment.

By: joder666

joder666 — Mon, 02 May 2011 19:33:54 +0000

Thousand thanks mate this works like a charm on pinguy 10.10.1!!

By: Jason Wagner

Jason Wagner — Wed, 06 Apr 2011 14:33:07 +0000

Worked perfectly on Ubuntu 10.10. THANKS!

By: Tom

Tom — Fri, 11 Mar 2011 01:17:51 +0000

It doesn’t work for my Toshiba P100 with Intel chipset 945.
See only 3GB RAM. Thanks anyway.

By: MaX

MaX — Tue, 18 Jan 2011 09:36:14 +0000

I tried this on dell n5010 and it worked. Thanks Vivek

By: gfeng

gfeng — Wed, 05 Jan 2011 20:01:31 +0000

4GB RAM only map 3.2GB. dmesg logs

[ 0.000000] x86 PAT enabled: cpu 0, old 0×7040600070406, new 0×7010600070106
[ 0.000000] original variable MTRRs
[ 0.000000] reg 0, base: 0GB, range: 2GB, type WB
[ 0.000000] reg 1, base: 2GB, range: 1GB, type WB
[ 0.000000] reg 2, base: 3GB, range: 256MB, type WB
[ 0.000000] reg 3, base: 3327MB, range: 1MB, type UC
[ 0.000000] total RAM covered: 3327M

$ uname -a
Linux machine 2.6.35.9-64.fc14.x86_64 #1 SMP Fri Dec 3 12:19:41 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux

By: arat

arat — Wed, 05 Jan 2011 18:20:05 +0000

confirming that option[2] works fine for ubuntu 10.10 desktop edition

By: Per

Per — Mon, 20 Dec 2010 22:05:13 +0000

that oneliner did the trick with 10.10 and 8GB

By: Paul

Paul — Mon, 20 Dec 2010 12:22:18 +0000

Dual Boot: For those preparing too switch to Ubuntu 64 bit version and have Vista 64 bit installed I highly recommend using a separate hard drive to install the newest kernel 10.04 to. In addition unplugging your vista hard drive at installation time will prevent an overwrite to your MBR (master boot record) on your Vista Installation. In this fashion you can start either operating system from your BIOS not within Ubuntu. That way if you ever want to upgrade to Windows 7 your MBR won’t be a mess. Of course same follows you will need to unplug your Ubuntu installation if upgrading from Vista to 7. I gave my swap partition more than the 8 gig of memory installed so I could run other background programs at start up.
Comments:
2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 10:14:11 UTC 2010 x86_64 GNU/Linux
free -m
total used free shared buffers cached
Mem: 8003 1184 6818 0 96 486
-/+ buffers/cache: 601 7401
Swap: 9703 0 9703
Biostar TA790GX 128m
8 gig pny memory ddr2 800
AMD 9750 quad core cpu
Vista ultimate 64 bit/Ubuntu 64 bit