Hi,
I installed debian 12 32bit on an old dell optiplex gx280 with 4gb of ddr2 ram but the system only reads 3gb.
Is there any way to use whole ram memory?
Thanks.
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4gb ram on 32bit system
- oswaldkelso
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Re: 4gb ram on 32bit system
https://en.wikipedia.org/wiki/3_GB_barrier
Linux or certain versions of Windows Server and macOS that allow use of Physical Address Extension (PAE) mode on x86 to access more than 4 GiB of RAM.
Linux or certain versions of Windows Server and macOS that allow use of Physical Address Extension (PAE) mode on x86 to access more than 4 GiB of RAM.
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Ash init durbatulûk, ash init gimbatul,
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My oldest used PC: 1999 imac 333Mhz 256MB PPC abandoned by Debian
Re: 4gb ram on 32bit system
Linux reserves some memory for buffering.
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free -h
total used free shared buff/cache available
Mem: 7,7Gi 2,3Gi 4,8Gi 318Mi 1,1Gi 5,4Gi
Swap: 7,4Gi 415Mi 7,0Gi
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Re: 4gb ram on 32bit system
Post output of and
As posted above, free -h may be misleading. Here it shows 15Gi for 16GB RAM.
Code: Select all
free -m
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free --giga
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Re: 4gb ram on 32bit system
Some utilities will get the totals wrong. To check if the system is seeing the memory
One thing to be careful of is zramswap. It will size according to MemTotal but will swap with reference to the 'single process max' of ~3.5GiB.
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$ grep MemTotal /proc/meminfo
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$ uname -a & free -h
[1] 27780
Linux user 6.1.0-10-686-pae #1 SMP PREEMPT_DYNAMIC Debian 6.1.38-1 (2023-07-14) i686 GNU/Linux
total used free shared buff/cache available
Mem: 7.8Gi 1.8Gi 5.8Gi 217Mi 1.1Gi 6.0Gi
Swap: 255Mi 0B 255Mi