[libvirt] incorrect memory size inside vm

[Vasiliy Tolstov]

Hi. I have issue with incorrect memory side inside vm. I'm try utilize
memory balloon (not memory hotplug, because i have guest without
memory hotplug (may be)).

When domain started with static memory all works fine, but then i'm
specify in libvirt
memory = 16384 , maxMemory = 16384 and currentMemory = 1024, guest in
f/rpoc/meminfo says that have only 603608 Kb memory. Then i set memory
via virsh setmem to 2Gb, guest see only 1652184 Kb memory.

software versions
libvirt: 1.2.10
qemu: 2.3.0
Guest OS: centos 6.

qemu.log:
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
HOME=/root USER=root LOGNAME=root QEMU_AUDIO_DRV=none /usr/bin/kvm
-name 26543 -S -machine pc-i440fx-1.7,accel=kvm,usb=off -m 1024
-realtime mlock=off -smp 1,maxcpus=4,sockets=4,cores=1,threads=1 -uuid
4521fb01-c2ca-4269-d2d6-0000035fd910 -no-user-config -nodefaults
-chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/26543.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
-no-shutdown -boot strict=on -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device
virtio-scsi-pci,id=scsi0,num_queues=1,bus=pci.0,addr=0x4 -device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive
file=/dev/vg4/26543,if=none,id=drive-scsi0-0-0-0,format=raw,cache=none,discard=unmap,aio=native,iops=5000
-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1
-drive if=none,id=drive-scsi0-0-1-0,readonly=on,format=raw -device
scsi-cd,bus=scsi0.0,channel=0,scsi-id=1,lun=0,drive=drive-scsi0-0-1-0,id=scsi0-0-1-0
-netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=52 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:00:34:f7,bus=pci.0,addr=0x3,rombar=0
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/26543.agent,server,nowait
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
-device usb-mouse,id=input0 -device usb-kbd,id=input1 -vnc
[::]:8,password -device VGA,id=video0,bus=pci.0,addr=0x2 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -object
rng-random,id=rng0,filename=/dev/random -device
virtio-rng-pci,rng=rng0,max-bytes=1024,period=2000,bus=pci.0,addr=0x7
-msg timestamp=on

-- 
Vasiliy Tolstov,
e-mail: v.tolstov at selfip.ru