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Old 07-13-2008, 12:11 AM
JJB
 
Default 2.6.18-92.1.6.el5xen -- 8GB missing?

Hello,

Last night I upgraded a server to CentOS 5.2. The server has 16GB of
RAM. Now that it's running 2.6.18-92.1.6.el5xen only 8GB is reported to
exist.

# cat /proc/meminfo
MemTotal: 8818688 kB
MemFree: 3730124 kB
Buffers: 202004 kB
Cached: 4086788 kB
SwapCached: 0 kB
Active: 1551480 kB
Inactive: 2958196 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 8818688 kB
LowFree: 3730124 kB
SwapTotal: 8388600 kB
SwapFree: 8388600 kB
Dirty: 7348 kB
Writeback: 0 kB
AnonPages: 220788 kB
Mapped: 46948 kB
Slab: 137404 kB
PageTables: 29012 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 12797944 kB
Committed_AS: 756072 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 5004 kB
VmallocChunk: 34359733235 kB

However, dmesg appears to report something else:

# dmesg | grep Memory
Memory: 15506152k/15899468k available (2417k kernel code, 384480k
reserved, 1350k data, 176k init)

I looked in the messages file for complaints and didn't see anything
that strikes me as unusual.

How much memory is available? Is this a known issue?


_______________________________________________
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CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
 
Old 07-13-2008, 12:27 AM
"Victor Padro"
 
Default 2.6.18-92.1.6.el5xen -- 8GB missing?

On Sat, Jul 12, 2008 at 7:11 PM, JJB <jack@internetguy.net> wrote:

Hello,



Last night I upgraded a server to CentOS 5.2. *The server has 16GB of

RAM. *Now that it's running 2.6.18-92.1.6.el5xen only 8GB is reported to

exist.



# cat /proc/meminfo

MemTotal: * * *8818688 kB

MemFree: * * * 3730124 kB

Buffers: * * * *202004 kB

Cached: * * * *4086788 kB

SwapCached: * * * * *0 kB

Active: * * * *1551480 kB

Inactive: * * *2958196 kB

HighTotal: * * * * * 0 kB

HighFree: * * * * * *0 kB

LowTotal: * * *8818688 kB

LowFree: * * * 3730124 kB

SwapTotal: * * 8388600 kB

SwapFree: * * *8388600 kB

Dirty: * * * * * *7348 kB

Writeback: * * * * * 0 kB

AnonPages: * * *220788 kB

Mapped: * * * * *46948 kB

Slab: * * * * * 137404 kB

PageTables: * * *29012 kB

NFS_Unstable: * * * *0 kB

Bounce: * * * * * * *0 kB

CommitLimit: *12797944 kB

Committed_AS: * 756072 kB

VmallocTotal: 34359738367 kB

VmallocUsed: * * *5004 kB

VmallocChunk: 34359733235 kB



However, dmesg appears to report something else:



# dmesg | grep Memory

Memory: 15506152k/15899468k available (2417k kernel code, 384480k

reserved, 1350k data, 176k init)



I looked in the messages file for complaints and didn't see anything

that strikes me as unusual.



How much memory is available? *Is this a known issue?





_______________________________________________

CentOS mailing list

CentOS@centos.org

http://lists.centos.org/mailman/listinfo/centos


I think there was a topic like this about a month ago, please search the list archieves.

Cheers.
--
"It is human nature to think wisely and act in an absurd fashion."


"Todo el desorden del mundo proviene de las profesiones mal o mediocremente servidas"
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http://lists.centos.org/mailman/listinfo/centos
 
Old 07-13-2008, 03:50 AM
Ruslan Sivak
 
Default 2.6.18-92.1.6.el5xen -- 8GB missing?

Victor Padro wrote:



On Sat, Jul 12, 2008 at 7:11 PM, JJB <jack@internetguy.net
<mailto:jack@internetguy.net>> wrote:


Hello,

Last night I upgraded a server to CentOS 5.2. The server has 16GB of
RAM. Now that it's running 2.6.18-92.1.6.el5xen only 8GB is
reported to
exist.
...snip...

How much memory is available? Is this a known issue?


I think there was a topic like this about a month ago, please search
the list archieves.


Cheers.


In case he didn't find it, I was the one that posted the original
issue. Turns out that Xen allocates memory to domU's and doesn't
release it back to dom0 even if you stop the VM's. Top only reports the
memory available to dom0. The xen tools will show the proper amount of
memory.


Russ
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