[Qemu-devel] [Bug 680758] Re: balloon only resizes by 2M

[a1bert]

the same here:

host debian squeeze: qemu-kvm-0.12.5
guest: windows 2008 server 
balloon driver: 6.1.7600.16385  10.8.2010



~# virsh  -c qemu:///system dominfo 9 | grep Used
Used memory:    2064384 kB
~# virsh  -c qemu:///system setmem 9 512000

~# virsh  -c qemu:///system dominfo 9 | grep Used
Used memory:    2062336 kB


the same host,  but winXP guest with the same balloon driver is working, looks 
like balloon driver issue...

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https://bugs.launchpad.net/bugs/680758

Title:
  balloon only resizes by 2M

Status in QEMU:
  New

Bug description:
  when in monitor and running balloon 512 from a 1024M VM, the vm dropped the 
size to 1020 (this value changes), then every subsequent request to balloon 512 
will drop it by another 2M.  The system was running at above 60% RAM free when 
these requests were made.  also requesting to up the ram results in no change 
above 1024 (I'm guessing this is intentional, but was unable to find any 
documentation)

Versions:

qemu-kvm 0.13.0
qemu-kvm.git b377474e589e5a1fe2abc7b13fafa8bad802637a

Qemu Command Line:

./x86_64-softmmu/qemu-system-x86_64 -drive 
file=/var/machines/seven.base,if=virtio -net 
nic,model=virtio,macaddr=02:00:00:00:00:01 -net 
tap,script=/etc/qemu/qemu-ifup,downscript=/etc/qemu/qemu-ifdown -vga std -usb 
-usbdevice tablet -rtc base=localtime,clock=host -watchdog i6300esb -balloon 
virtio -m 1024 -no-quit -smp 2 -monitor stdio

Monitor Session:

QEMU 0.13.50 monitor - type 'help' for more information
(qemu) info balloon
balloon: actual=1024
(qemu) balloon 1536
(qemu) info balloon
balloon: actual=1024
(qemu) balloon 512
(qemu) info balloon
balloon: actual=1020
(qemu) info balloon
balloon: actual=1020
(qemu) balloon 512
(qemu) info balloon
balloon: actual=1018