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From: "Artem Kuchin" <matrix@itlegion.ru>
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Date: Sat, 21 Apr 2007 18:14:29 +0400
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Subject: PAE does not give any ram increase, why?
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Hello!

I've upgraded one of my servers today.
Now it is
Asus P5p800-VM
Pentium D 3.0Ghz
4GB RAM (4x1 GB)
3WARE raid5

FreebSD 6.2 cvsed today compiled from sources.

after that i decided to try PAE. It runs just fine but
when i compare available memory with and without
pae i do not see any difference.

At kernel boot with PAE it says:

pr 21 18:01:30 osiris kernel: ACPI APIC Table: <A M I  OEMAPIC >
Apr 21 18:01:30 osiris kernel: Timecounter "i8254" frequency 1193182 Hz quality 0
Apr 21 18:01:30 osiris kernel: CPU: Intel(R) Pentium(R) D CPU 3.00GHz (3000.33-MHz 686-class CPU)
Apr 21 18:01:30 osiris kernel: Origin = "GenuineIntel"  Id = 0xf64  Stepping = 4
Apr 21 18:01:30 osiris kernel: 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2
Apr 21 18:01:30 osiris kernel: Features2=0xe49d<SSE3,RSVD2,MON,DS_CPL,EST,CNTX-ID,CX16,<b14>,<b15>>
Apr 21 18:01:30 osiris kernel: AMD Features=0x20000000<LM>
Apr 21 18:01:30 osiris kernel: AMD Features2=0x1<LAHF>
Apr 21 18:01:30 osiris kernel: Cores per package: 2
Apr 21 18:01:30 osiris kernel: real memory  = 4017881088 (3831 MB)
Apr 21 18:01:30 osiris kernel: avail memory = 3933429760 (3751 MB)

The real and avail memory sizes are the same w/o PAE.

Then i do
sysctl -a | grep hw | grep mem

and i always see
hw.physmem: 4012244992
hw.usermem: 3861307392
hw.realmem: 4017881088
hw.pci.host_mem_start: 2147483648

the number do not change with or without PAE

Maybe i look in the wrong place?

--
Regards,
Artem