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Date: Thu, 24 Oct 2013 22:53:01 +0200
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Subject: Guest reports wrong amount of RAM with RAM overprovisioning
From: Andrija Panic <andrija.panic@gmail.com>
To: users@cloudstack.apache.org
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Hi,

I have updated to CS 4.2 (not sure that my problem has to do anything with
that...)
I have RAM overprovisioning level of 2 on Cluster level.

And after I start VM with compute ofering of 2GHZ (1x2gHz) and 2GB of ram,
it does invoke qemu-kvm with good parameters (2048M), but inside my VM when
doing top, or free -m, it reports rougly 50% of that amount:

Here is the ps axu | grep vname #from host on which VM is running:

root     17264  5.9  2.1 3447568 1090636 ?     Sl   22:35   0:23
/usr/libexec/qemu-kvm -name i-2-248-VM -S -M rhel6.4.0 -enable-kvm *-m 2048
-*smp 1,sockets=3D1,cores=3D1,threads=3D1 -uuid 45087776-1238-4255-a87f-7ae=
6bcddc4a3
-nodefconfig -nodefaults -chardev socket,id=3Dcharmonitor,path=3D/
var/lib/libvirt/qemu/i-2-248-VM.monitor,server,nowait -mon
chardev=3Dcharmonitor,id=3Dmonitor,mode=3Dcontrol -rtc base=3Dutc -no-shutd=
own
-device piix3-usb-uhci,id=3Dusb,bus=3Dpci.0,addr=3D0x1.0x2 -drive
file=3D/var/lib/libvirt/images/aa0d036a-f814-4cd8-991f-
d0a0ad21a7d4,if=3Dnone,id=3Ddrive-virtio-disk0,format=3Dqcow2,cache=3Dnone =
-device
virtio-blk-pci,scsi=3Doff,bus=3Dpci.0,addr=3D0x4,drive=3Ddrive-
virtio-disk0,id=3Dvirtio-disk0,bootindex=3D2 -drive
if=3Dnone,media=3Dcdrom,id=3Ddrive-ide0-1-0,readonly=3Don,format=3Draw,cach=
e=3Dnone
-device ide-drive,bus=3Dide.1,unit=3D0,drive=3Ddrive-ide0-1-0,id=3Dide0-1-0=
,bootindex=3D1
-netdev tap,fd=3D23,id=3Dhostnet0,vhost=3Don,vhostfd=3D36 -device
virtio-net-pci,netdev=3Dhostnet0,id=3Dnet0,mac=3D06:b0:24:00:00:66,bus=3Dpc=
i.0,addr=3D0x3
-chardev pty,id=3Dcharserial0 -device isa-serial,chardev=3Dcharserial0,id=
=3Dserial0
-device usb-tablet,id=3Dinput0 -vnc0.0.0.0:12,password -vga cirrus -device
virtio-balloon-pci,id=3Dballoon0,bus=3Dpci.0,addr=3D0x5

>From inside VM:

# free -m
             *total*       used       free     shared    buffers     cached
Mem:           *853*         92        761          0          5         28
-/+ buffers/cache:         58        795
Swap:         4095          0       4095

Same for top.
Not sure what is happening, has to do something with RAM overprovisioning
factor ?
How is this possible, when qemu-kvm parameteres seems fine (-m 2048)

Thanks,
--=20

Andrija Pani=C4=87

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