Re: [gentoo-user] Less available memory than installed

[Dale]

Toldi Balázs wrote:
> Hello!
>
> In my current PC I have 16 GB of RAM installed. It worked fine until
> today, when I upgraded my CPU from a Ryzen 5 1500X to a Ryzen 7 2700.
> The system boots up just fine, but when I use the free command the
> total memory is only 8 GB. When I looked into the BIOS, it showed me
> the correct amount. What should I do?
>
> Output of some relevant commands:
>
> free -h
>
>                total        used        free      shared buff/cache  
> available
> Mem:           7,8Gi       4,4Gi       874Mi       192Mi 2,5Gi      
> 3,1Gi
>
> cat /proc/meminfo
>
> MemTotal:        8158220 kB
> MemFree:          910036 kB
> MemAvailable:    3275008 kB
> Buffers:            2848 kB
> Cached:          2492392 kB
> SwapCached:          260 kB
> Active:          1622988 kB
> Inactive:        4198676 kB
> Active(anon):       9500 kB
> Inactive(anon):  3507660 kB
> Active(file):    1613488 kB
> Inactive(file):   691016 kB
> Unevictable:          64 kB
> Mlocked:              64 kB
> SwapTotal:      16777212 kB
> SwapFree:       16775140 kB
> Dirty:               732 kB
> Writeback:             0 kB
> AnonPages:       3326444 kB
> Mapped:          1322720 kB
> Shmem:            193816 kB
> KReclaimable:     160248 kB
> Slab:             556240 kB
> SReclaimable:     160248 kB
> SUnreclaim:       395992 kB
> KernelStack:       32704 kB
> PageTables:        58964 kB
> NFS_Unstable:          0 kB
> Bounce:                0 kB
> WritebackTmp:          0 kB
> CommitLimit:    20856320 kB
> Committed_AS:   15151980 kB
> VmallocTotal:   34359738367 kB
> VmallocUsed:      260776 kB
> VmallocChunk:          0 kB
> Percpu:            10944 kB
> HugePages_Total:       0
> HugePages_Free:        0
> HugePages_Rsvd:        0
> HugePages_Surp:        0
> Hugepagesize:       2048 kB
> Hugetlb:               0 kB
> DirectMap4k:     1638688 kB
> DirectMap2M:     6699008 kB
> DirectMap1G:     1048576 kB
>
>
>  lshw -C memory
>
> *-memory
>        description: System Memory
>        physical id: 27
>        slot: System board or motherboard
>        size: 7967MiB
>      *-bank:0
>           description: [empty]
>           product: Unknown
>           vendor: Unknown
>           physical id: 0
>           serial: Unknown
>           slot: DIMM 0
>      *-bank:1
>           description: DIMM DDR4 Synchronous Unbuffered (Unregistered)
> 2400 MHz (0,4 ns) [empty]
>           product: 9905702-120.A00G
>           vendor: Kingston
>           physical id: 1
>           serial: EE963485
>           slot: DIMM 1
>           width: 64 bits
>           clock: 2400MHz (0.4ns)
>      *-bank:2
>           description: [empty]
>           product: Unknown
>           vendor: Unknown
>           physical id: 2
>           serial: Unknown
>           slot: DIMM 0
>      *-bank:3
>           description: DIMM DDR4 Synchronous Unbuffered (Unregistered)
> 2400 MHz (0,4 ns) [empty]
>           product: Unknown
>           vendor: Unknown
>           physical id: 3
>           serial: 08240800
>           slot: DIMM 1
>           width: 64 bits
>           clock: 2400MHz (0.4ns)
>
>
> uname -a
>
> Linux GlaDOS 5.10.27-gentoo #4 SMP Thu Jun 3 18:19:23 CEST 2021 x86_64
> AMD Ryzen 7 2700 Eight-Core Processor AuthenticAMD GNU/Linux
>
>
>
>


Could this be a kernel setting issue?  If you boot some other media like
a USB stick, DVD/CD or something, does it show the right amount then? 
If it does, could be a kernel setting.  If not, interesting problem. 

If the BIOS sees it, I doubt it is a hardware issue.  It may not rule it
out 100% but not likely. 

It's amazing that things like this still occur when large amounts of
memory has been around for a good while now. 

Hope that helps?

Dale

:-)  :-)