Date: Sat, 8 May 2021 20:44:50 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Eugene Grosbein <eugen@grosbein.net> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Install of 13.0-RELEASE i386 with ZFS root hangs up Message-ID: <YJbOEvRfoMlX8fdn@kib.kiev.ua> In-Reply-To: <4bee4d1d-46a7-e0d1-48d9-c3e964a05ef0@grosbein.net> References: <20210507.214759.1825935389016318351.yasu@utahime.org> <CAOjFWZ4m6ctgA%2BzOXXKk-cfEgypTcFKH58%2BVyJO%2BH4b=0nA=JQ@mail.gmail.com> <YJWakGZvOtvrEZ1C@kib.kiev.ua> <4bee4d1d-46a7-e0d1-48d9-c3e964a05ef0@grosbein.net>
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On Sat, May 08, 2021 at 06:33:02PM +0700, Eugene Grosbein wrote: > 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 (git@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 Some necromancy revealed that this CPU did not have memory controller on-chip, it was a design from the 2008 where MCH handled memory. It is up to the chipset and BIOS to configure and report the memory above 4G to OS. As you clearly see from the SMAP printed above, BIOS does not report anything above 4G. Might be, look at bios settings. No other ideas.
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