Re: >60gb of reserved memory??

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On Thu, 2018-06-21 at 19:05 +0300, Susi Lehtola wrote:
> Dear all,
> 
> 
> I just noticed a very weird problem on my workstation. Although the 
> machine has 64 GB of RAM installed,
> 
> $ head -n 1 /proc/meminfo
> MemTotal:        2400748 kB
> 
> that is, only a few gigabytes are actually available.
> 
> Unfortunately I don't have physical access to the machine, which is a HP 
> desktop bought last fall. According to dmesg, the model is something like
> 
> [    0.000000] DMI: HP HP EliteDesk 800 G3 TWR/8298, BIOS P01 Ver. 02.06 
> 06/09/2017
> 
> Also according to dmesg, it appears that the kernel *does* see all 64 
> gigs, BUT OVER 60 GB IS RESERVED MEMORY!!
> 
> [    0.000000] Memory: 2326720K/66985176K available (12300K kernel code, 
> 1568K rwdata, 3836K rodata, 2124K init, 1368K bss, 64658456K reserved, 
> 0K cma-reserved)
> 
> Does anyone have any idea of what could be going on?
> 
> I am running an up-to-date Fedora 27 x86_64 with kernel 
> 4.16.15-200.fc27.x86_64.--

AFAIK Fedora uses the available RAM as a) buffer space, and b) the /tmp
filesystem.

BTW a slightly more user-friendly way to get that info is with the
free(1) command.

poc
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