Re: PAE does not give any ram increase, why?

Artem Kuchin Sat, 21 Apr 2007 13:32:26 -0700

Andrew Pantyukhin wrote:

On 4/21/07, Artem Kuchin <[EMAIL PROTECTED]> wrote:

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 0Apr 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 = 4Apr 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?


What number do you expect to see? 8Gb?


I expect to see DIFFERENCE (in particular INCREASE) in amount of memory with PAE

comparing to kernel w/o PAE.And 4 GB = 1024*4 MB = 1024*1024*4 KB == 1024*1024*1024*4=4294967296


So, where is my 277086208 bytes?
(ieven is built-in video eats 128MB for AGP aperture then still
whene is my another almost 120MB?)

--
Regards,
Artem



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Re: PAE does not give any ram increase, why?

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