08.05.2021 2:52, Konstantin Belousov wrote:

> i386 kernel uses memory up to 24G since 13.0.
> 
> PAE only means that devices that can access full 64bit address are allowed
> to avoid dma bouncing.

Maybe you could tell something on similar topic?

There is FreeBSD 12.2-STABLE r369567 Base12 amd64 running
with Intel Atom CPU capable of long mode and addressing 8GB RAM,
ASRock A330ION motherboard and two memory modules installed: 4G+2GB.
Why so small "avail memory"?

FreeBSD clang version 10.0.1 (g...@github.com:llvm/llvm-project.git 
llvmorg-10.0.1-0-gef32c611aa2)
CPU: Intel(R) Atom(TM) CPU  330   @ 1.60GHz (1600.03-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x106c2  Family=0x6  Model=0x1c  Stepping=2
  
Features=0xbfe9fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x40e31d<SSE3,DTES64,MON,DS_CPL,TM2,SSSE3,CX16,xTPR,PDCM,MOVBE>
  AMD Features=0x20000800<SYSCALL,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant, performance statistics
real memory  = 6442450944 (6144 MB)
Physical memory chunk(s):
0x0000000000010000 - 0x000000000009dfff, 581632 bytes (142 pages)
0x0000000000103000 - 0x00000000001fffff, 1036288 bytes (253 pages)
0x0000000002b00000 - 0x00000000d8709fff, 3586170880 bytes (875530 pages)
avail memory = 3571384320 (3405 MB)

Also http://www.grosbein.net/freebsd/dmidecode.txt

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