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

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.



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

On Mon, Aug 13, 2012 at 2:02 PM, Denis Cardon
<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 ---

    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
        Mem:           309        284         24          0          6
        -/+ buffers/cache:        161        147
        Swap:          511          0        511


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

        *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) <tel:%2B33%20%280%29%>
    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)

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