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

[Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>]

Hi Ananthan,

>                         Thank you very much for clarifying my
> concern.But what i really want was to run all the Virtual Machine on
> shared memory /dev/shm (tmpfs).i have done it using xen by copying
> virtual image .img files to /dev/shm and started from there.But for
> doing that when i checked memory status i found this thing.is
> <http://thing.is> there a way to make the VM run on /dev/shm rather on
> HDD,to avoid i/o wait.
you can increase the RAM of dom0 by changing the dom0_mem value in 
extlinux.conf and restarting your XCP server. However 4GiB is not a lot 
of ram and you won't have much room for putting both vm content and ram...
Afterward, you will have to create a storage repository (xe sr-create) 
on /dev/shm to store your vdi there. I don't know if it works out of the 
box on ramdisk.
Cheers,

Denis

PS : please, try to answer on the mailing list.

> On Mon, Aug 13, 2012 at 2:02 PM, Denis Cardon
> <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx
> <mailto:denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>> wrote:
>
>     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 <tel:%2B33%20%280%29%202.40.97.57.57>
>     http://www.tranquil-it-__systems.fr <http://www.tranquil-it-systems.fr>

--
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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