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Hi Guys:
My machine has 8G memory, when I use kernel boot parameter mem=5G , it only
display “4084 M” using “free ?m “.
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? |