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

From: Thomas Huth
Subject: [Qemu-devel] [Bug 680758] Re: balloon only resizes by 2M
Date: Wed, 09 Nov 2016 12:32:12 -0000

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

** Changed in: qemu
       Status: New => Incomplete

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  balloon only resizes by 2M

Status in QEMU:

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)


  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

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