Missing Memory

[Shay Gover]

It's possible that they're reserved for some hardware device.

On Thu, Dec 14, 2017 at 7:42 PM, Travis Waters <Travis.Waters at sdl.usu.edu>
wrote:

> Hello Linux Users!
>
>
> We are developing a single-board embedded system based around a SPARC
> architecture processor with 256 MB SRAM.  When we cat /proc/meminfo our
> MemTotal is showing a missing 73 MB.   When checking our dmesg, we have the
> following reported memory:
>
> Memory: 172848K/176868K available (3886K kernel code, 136K rwdata, 740K
> rodata, 14228K init, 152K bss, 4020K reserved, 0K cma-reserved, 0K highmem)
>
> Which in all accounts for 22 of the missing 73 MB, but what of the other
> 51 MB?  Can that 51 MB be accounted for somewhere, or are we missing
> something in our memory tables somehow?
>
>
> We have also had to increase the VMalloc size, and in the SPARC
> architecture that means changing the pgtable_32.h macros to the following
> (SPARC isn't responding to setting the vmalloc kernel parameter):
>
> #define VMALLOC_START           _AC(0xfd600000,UL)
> #define VMALLOC_END              _AC(0xffc00000,UL)
>
>
> Here is the full meminfo report:
>
>
> MemTotal:         187076 kB
> MemFree:           98196 kB
> MemAvailable:     138116 kB
> Buffers:               0 kB
> Cached:            44248 kB
> SwapCached:            0 kB
> Active:            13164 kB
> Inactive:          39292 kB
> Active(anon):       8208 kB
> Inactive(anon):        0 kB
> Active(file):       4956 kB
> Inactive(file):    39292 kB
> Unevictable:           0 kB
> Mlocked:               0 kB
> HighTotal:             0 kB
> HighFree:              0 kB
> LowTotal:         187076 kB
> LowFree:           98196 kB
> SwapTotal:             0 kB
> SwapFree:              0 kB
> Dirty:                 0 kB
> Writeback:             0 kB
> AnonPages:          8220 kB
> Mapped:            14800 kB
> Shmem:                 0 kB
> Slab:               4736 kB
> SReclaimable:        964 kB
> SUnreclaim:         3772 kB
> KernelStack:         968 kB
> PageTables:          376 kB
> NFS_Unstable:          0 kB
> Bounce:                0 kB
> WritebackTmp:          0 kB
> CommitLimit:       93536 kB
> Committed_AS:     106592 kB
> VmallocTotal:      25600 kB
> VmallocUsed:           0 kB
> VmallocChunk:          0 kB
>
>
>
> Thanks!
>
> -Travis?
>
>
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