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Centos 64 bit only seeing 3834MB Ram

Posted on 2011-09-05
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Last Modified: 2012-06-22
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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Question by:fosiul01
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12 Comments
 
LVL 78

Expert Comment

by:arnold
ID: 36484417
You need to insall the kernel-pae version
yum install kernel-pae

http://www.centos.org/modules/newbb/viewtopic.php?topic_id=8457
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Author Comment

by:fosiul01
ID: 36484433
but kernel-pae for 32 bit system

its 64bit Os

please look uname-a ouput on the question..
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Expert Comment

by:arnold
ID: 36484490
0
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LVL 29

Author Comment

by:fosiul01
ID: 36484495
tryed that already ..
did not work ..

0
 
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Expert Comment

by:arnold
ID: 36484506
cat /proc/meminfo what is being reported there?
0
 
LVL 29

Author Comment

by:fosiul01
ID: 36484512
MemTotal:      3926888 kB
MemFree:       3804900 kB
Buffers:          6680 kB
Cached:          36688 kB
SwapCached:          0 kB
Active:          55816 kB
Inactive:        27808 kB

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Accepted Solution

by:
arnold earned 500 total points
ID: 36484634
Do you have the same behavior if you boot the system using centos live CD?
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Author Comment

by:fosiul01
ID: 36484645
yup

same but debian live Cd works!!!
no centos
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LVL 78

Expert Comment

by:arnold
ID: 36484712
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.
0
 
LVL 29

Author Comment

by:fosiul01
ID: 36484781
ok i will try with that one


just a question

is security updates on Oracle vm free ???

any idea ??
0
 
LVL 29

Author Comment

by:fosiul01
ID: 36484782
sorry oracl Linux

security updates of oracle Linux free ? any idea?
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Expert Comment

by:arnold
ID: 36485232
I'm not sure what you mean?


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