Ubuntu 12.04 LTS 32bit does not detect 4Gb ram
Solution 1
@fossfreedom - Problem has been fixed by upgrading the BIOS to the most recent one. Thanks for the hint! See available memory output after the change:
administrator@Root2:~$ free -m
total used free shared buffers cached
Mem: 4026 1105 2921 0 45 311
-/+ buffers/cache: 748 3278
Solution 2
Even if you were running windows you wouldn't see the entire 4gb of memory allocated. Part of it is reserved for Graphics Ram. If you go to the Manufacturer website and look at the technical specs for your system under memory it will tell you how much of the installed memory is usable.
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David
Updated on September 18, 2022Comments
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David over 1 year
I have recently installed 4Gb of ram for an existing 12.04 32bit Ubuntu. It's not being recognised, only 3.2Gb is showing, See:
administrator@Root2:~$ free total used free shared buffers cached Mem: 3355256 1251112 2104144 0 48664 391972 -/+ buffers/cache: 810476 2544780
System is PAE capable, See:
administrator@Root2:~$ grep --color=always -i PAE /proc/cpuinfo 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 arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts 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 arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts
The system us fully patched and tried to run manual PAE upgrade, See:
administrator@Root2:~$ sudo apt-get install linux-generic-pae linux-headers-generic-pae [sudo] password for administrator: Reading package lists... Done Building dependency tree Reading state information... Done linux-generic-pae is already the newest version. linux-headers-generic-pae is already the newest version. The following packages were automatically installed and are no longer required: language-pack-zh-hans language-pack-kde-en language-pack-kde-zh-hans language-pack-kde-en-base kde-l10n-engb kde-l10n-zhcn language-pack-zh-hans-base firefox-locale-zh-hans language-pack-kde-zh-hans-base Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
I am not sure what else to try to recognise the full physical memory installed other than loading 64bit. Any thoughts? Thanks!
output of uname -r
administrator@Root2:~$ uname -r 3.2.0-24-generic-pae
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Admin about 12 yearsLooks correct to me. You'll need 64 bit. IIRC each single process is limited to 3 Gb under 32bit, so that's why you see that.
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Admin about 12 yearsI don't think the per-process memory limitation is the problem. It looks to me like, for some reason, the PAE kernel is not actually running. Have you checked to see if it is? Can you add the output of
uname -r
to your question? -
Admin about 12 years@ Eliah: Yea, you're right, I missed that he's looking at total ram installed, not per process.
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Admin about 12 years@Eliah Kagan See output or the current version: administrator@Root2:~$ uname -r 3.2.0-24-generic-pae
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Admin about 12 years@gecko,
free
reports system memory, not its own memory. It looks like a problem with the motherboard. Check the output ofdmesg
or the contents of /var/log/kern.log and look for the section with the e820 memory map and add that info to the question.
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Seven about 12 yearsHe can use more than 3 Gb, just not in a single process. :-)
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Eliah Kagan about 12 yearsThis answer is incorrect. The 32-bit memory limitation is overcome by running the PAE kernel, which lets you access up to 64 GiB of RAM. See en.wikipedia.org/wiki/Physical_address_extension#Linux. The question is about why that's not working. (Sorry, didn't actually mean to downvote though, have undownvoted.)
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Rinzwind about 12 yearsThis answer is incorrect so accepting it is giving the wrong signal.
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David about 12 years@Robert Hollander : Yes I will upgrade it to 64bit to get it working. Obviously I tried to avoid doing it but there does not seem to be an alternative unfortunately. Thanks all for the input! Much appreciated!
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nilsonneto about 12 years@David - the other commenter's are correct - this answer is incorrect and you should perhaps need to consider the usefulness of accepting this answer for others in the future. Thanks!
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David about 12 years@fossfreedom : i have removed it as an answer. Thanks for pointing it out. I have googled this issue further - not much luck, so will go with the upgrade unless someone can advise a better alternative.
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nilsonneto about 12 years@David - what is your computer (make and model) - add this to your question. e.g. maybe a BIOS issue as per this Q&A? askubuntu.com/questions/80721/…
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David about 12 years@fossfreedom it's a Dell Vostro 200. I am looking at a possible BIOS issue too. Will update shortly.