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


From: Michael Thomas
Subject: [Qemu-devel] [Bug 680758] [NEW] balloon only resizes by 2M
Date: Wed, 24 Nov 2010 03:47:09 -0000

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

** Description changed:

  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
+ ./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

-- 
balloon only resizes by 2M
https://bugs.launchpad.net/bugs/680758
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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







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