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

[Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>]

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.
Cheers,

Denis


> *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
> *Description*
> 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
>
> *top*
> 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
>
> Regards,
> Ananthan,
> India
>
>
> 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) 2.40.97.57.57
http://www.tranquil-it-systems.fr


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