Hi Guys:

 

My machine has 8G memory, when I use kernel boot parameter mem=5G , it only display ¡°4084 M¡± using ¡°free ¨Cm ¡°.

where the ¡°5120-4084 = 1036M ¡° memory run?

 

# /bin/uname -a

Linux dom0-93 3.0.13-0.27-default #1 SMP Wed Feb 15 13:33:49 UTC 2012 (d73692b) x86_64 x86_64 x86_64 GNU/Linux

 

dom0-93:~ # free -m

total used free shared buffers cached

Mem: 4084 259 3824 0 6 84

-/+ buffers/cache: 169 3915

Swap: 1916 0 1916

dom0-93:~ # cat /proc/cmdline

root=/dev/disk/by-id/cciss-3600508b100104839535656314933001b-part1 resume=/dev/disk/by-id/cciss-3600508b100104839535656314933001b-part2 splash=silent crashkernel=256M-:128M vga=0x317 mem=5120M

 

 

when I didn't append "mem=" parmeter, "free -m " shows that total memory is  7892M ,

it only eat up  300M (8192-7892), though I don't know where the 300M memory go.

 

why?