graphic: 0.820
KVM: 0.713
x86: 0.702
performance: 0.660
PID: 0.636
ppc: 0.626
device: 0.587
socket: 0.576
virtual: 0.505
register: 0.401
arm: 0.389
peripherals: 0.383
kernel: 0.380
architecture: 0.369
network: 0.358
hypervisor: 0.338
boot: 0.337
vnc: 0.323
semantic: 0.307
mistranslation: 0.289
i386: 0.278
risc-v: 0.249
user-level: 0.217
VMM: 0.211
debug: 0.202
assembly: 0.176
files: 0.158
permissions: 0.155
TCG: 0.144

balloon only resizes by 2M

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 -ees/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

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... 

Triaging old bug tickets ... can you still reproduce this issue with the latest version of QEMU / the latest version of the balloon driver in the guest?

[Expired for QEMU because there has been no activity for 60 days.]