It's possible that they're reserved for some hardware device. On Thu, Dec 14, 2017 at 7:42 PM, Travis Waters <travis.wat...@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? > > > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >
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