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Re: [Xen-API] Only 309 MB of RAM is showing out of 4GB

Hi Ananthan,

     installed XCP 1.1 on intel i5 second gen processor  with 4 GB RAM
but *top,free -m,cat /proc/meminfo* is showing only 309 mb of RAM space....
     How can it be fixed..

dom0 memory is constrained by parameters in the extlinux boot param in/boot/extlinux.conf (look for the dom0_mem). Here in my conf below it is set to 752Mo, and it may vary after installation depending on the whole RAM of the server.

cat /boot/extlinux.conf

label xe
  # XCP
  kernel mboot.c32
append /boot/xen.gz dom0_mem=752M lowmem_emergency_pool=1M crashkernel=64M@32M console= vga=mode-0x0311 --- /boot/vmlinuz-2.6-xen root=LABEL=root-nddcwqei ro xencons=hvc console=hvc0 console=tty0 quiet vga=785 splash --- /boot/initrd-2.6-xen.img

RAM used by dom0 is not available for virtual machines, it is used for network bridging and physical block device handling, etc.

So it means that you have 4GiB - 300MiB of RAM available for your virtual machines.



*ouput from xsconsole *

*System Memory*
  Total memory                       4096 MB
  Populated memory sockets   2
  Total memory sockets           4
BIOS Information
Version      BLH6710H.86A.0119.2011.0523.1030
Vendor       Intel Corp

*Processor Details*
   Logical CPUs                       4
   Populated CPU Sockets        1
   Total CPU Sockets               1
x Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz

*free -m*
         total       used       free     shared    buffers     cached
Mem:           309        284         24          0          6        116
-/+ buffers/cache:        161        147
Swap:          511          0        511

Mem:    316416k total,   291956k used,    24460k free,     6644k buffers
Swap:   524280k total,        0k used,   524280k free,   119156k cached

*cat /proc/meminfo*

MemTotal:           316416 kB
MemFree:           24616 kB
Buffers:               6584 kB
Cached:              119072 kB
SwapCached:            0 kB
Active:                64236 kB
Inactive:             100496 kB
Active(anon):      38888 kB
Inactive(anon):     5024 kB
Active(file):      25348 kB
Inactive(file):    95472 kB
Unevictable:        6436 kB
Mlocked:            6436 kB
HighTotal:             0 kB
HighFree:              0 kB
LowTotal:         316416 kB
LowFree:           24616 kB
SwapTotal:        524280 kB
SwapFree:         524280 kB
Dirty:               532 kB
Writeback:             0 kB
AnonPages:         45544 kB
Mapped:            18040 kB
Shmem:               132 kB
Slab:              18636 kB
SReclaimable:       9612 kB
SUnreclaim:         9024 kB
KernelStack:        1520 kB
PageTables:            0 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:      682488 kB
Committed_AS:     660896 kB
VmallocTotal:     245752 kB
VmallocUsed:        4576 kB
VmallocChunk:     237148 kB
DirectMap4k:      754492 kB
DirectMap2M:           0 kB


This body part will be downloaded on demand.

Denis Cardon
Tranquil IT Systems
44 bvd des pas enchantés
44230 Saint Sébastien sur Loire
tel : +33 (0)

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