Centos 64 bit only seeing 3834MB Ram

fosiul01
fosiul01 used Ask the Experts™
on
Hi
i have installed Centos 64 bit on Windows 2008 Hyper -V.

guest has 5012 Ram

so centos should see 5GB of ram.

but its only see 3834 mb Ram !!


some info :

free -m
             total       used       free     shared    buffers     cached
Mem:          3834         89       3745          0         13         35
-/+ buffers/cache:         40       3794
Swap:         2943          0       2943
[root@sandbox ~]#
[root@sandbox ~]# uname -a
Linux sandbox. 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux



but
when i boot the same vm with Debian live 64 bit, its see full memmory

I never seen this problem before

can any one help me with this

thanks

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Distinguished Expert 2017

Commented:
You need to insall the kernel-pae version
yum install kernel-pae

http://www.centos.org/modules/newbb/viewtopic.php?topic_id=8457
Top Expert 2009

Author

Commented:
but kernel-pae for 32 bit system

its 64bit Os

please look uname-a ouput on the question..
Distinguished Expert 2017

Commented:
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Top Expert 2009

Author

Commented:
tryed that already ..
did not work ..

Distinguished Expert 2017

Commented:
cat /proc/meminfo what is being reported there?
Top Expert 2009

Author

Commented:
MemTotal:      3926888 kB
MemFree:       3804900 kB
Buffers:          6680 kB
Cached:          36688 kB
SwapCached:          0 kB
Active:          55816 kB
Inactive:        27808 kB

Distinguished Expert 2017
Commented:
Do you have the same behavior if you boot the system using centos live CD?
Top Expert 2009

Author

Commented:
yup

same but debian live Cd works!!!
no centos
Distinguished Expert 2017

Commented:
I think there is a setting for grub to reflect a larger memory alocation.
Try centos 6 liveCD and see if it too reflects the lower memory.
Top Expert 2009

Author

Commented:
ok i will try with that one


just a question

is security updates on Oracle vm free ???

any idea ??
Top Expert 2009

Author

Commented:
sorry oracl Linux

security updates of oracle Linux free ? any idea?
Distinguished Expert 2017

Commented:
I'm not sure what you mean?


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