Real and available memory?

[Jin Guojun [VFFS]]

Krassimir Slavchev wrote:

> ........
>
>>   
>
> I can't find anything related to video memory in the BIOS but it seems 
> to be correct
> real memory = 120 Mb reported by the kernel.
> My question is why the available memory  is only 80Mb?

Have every body looked your computer to see how many avaiable memory is 
there?
80 is a round-up number in 6.x release.
I think it looks normal to me. It really depends on how the system is 
configured.
Beside kernel memory, there is a number of wired memory blocks, which take
away available memory.

Below are some systems I can access --
(1) difference is 33MB
FreeBSD 4.11-RELEASE #1: Mon Dec 26 22:56:54 PST 2005
Timecounter "i8254"  frequency 1193182 Hz
CPU: AMD Athlon(TM) XP 2100+ (1733.41-MHz 686-class CPU)
...
real memory  = 1073721344 (1048556K bytes)
avail memory = 1039896576 (1015524K bytes)

(2) difference is 28MB
FreeBSD 6.1
CPU: AMD Turion(tm) 64 Mobile Technology ML-34 (1790.83-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x20f42  Stepping = 2
...
real memory  = 501874688 (478 MB)
avail memory = 472735744 (450 MB)

(3) difference is 340 MB
Intel(R) Xeon(TM) CPU 3.06GHz
hw.physmem: 2142212096
hw.usermem: 1785118720

-- 
------------ Jin Guojun ----------- v --- jin at george.lbl.gov ---
Distributed Systems Department		http://www.dsd.lbl.gov/~jin
Lawrence Berkeley National Laboratory,	Berkeley, CA 94720