[libvirt] incorrect memory size inside vm

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(a)selfip.ru