[Pkg-libvirt-maintainers] Bug#672720: libvirt-bin: KVM domains suspended with virsh suspend still use CPU time

[Kari Pahula]

Package: libvirt-bin
Version: 0.9.11.3-1
Severity: wishlist

I ran some tests with powertop and a wattmeter, and I'm not sure if
virsh suspend really does what it says.

With my system idle, no kvm domains running, powertop shows over 99%
C2 state and wattage goes down to almost 60W.

When I start a kvm domain and the virtual machine is idling after
booting, C2 state drops below 90%, wattage is at about 75W and top
shows kvm using about 10% CPU time.

When I run virsh suspend, I see no change in system load.  Man page
says:

  When in a paused state the domain will still consume allocated
  resources like memory, but will not be eligible for scheduling by
  the hypervisor.

Am I wrong in expecting to see my system load drop more towards the
idle system situation with suspend?  What else is it doing besides
keeping the domain in memory?

kvm doesn't like it if I kill -19 it...

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-2-amd64 (SMP w/6 CPU cores)
Locale: LANG=C, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libvirt-bin depends on:
ii  adduser             3.113+nmu1
ii  gettext-base        0.18.1.1-7
ii  libavahi-client3    0.6.31-1
ii  libavahi-common3    0.6.31-1
ii  libblkid1           2.20.1-4
ii  libc6               2.13-32
ii  libcap-ng0          0.6.6-1
ii  libdevmapper1.02.1  2:1.02.74-3
ii  libgcrypt11         1.5.0-3
ii  libgnutls26         2.12.19-1
ii  libnetcf1           0.1.9-2
ii  libnl1              1.1-7
ii  libnuma1            2.0.8~rc3-1
ii  libparted0debian1   2.3-9.1
ii  libpcap0.8          1.2.1-2
ii  libpciaccess0       0.13.1-2
ii  libreadline6        6.2-8
ii  libsasl2-2          2.1.25.dfsg1-4
ii  libudev0            175-3.1
ii  libvirt0            0.9.11.3-1
ii  libxenstore3.0      4.1.2-6
ii  libxml2             2.7.8.dfsg-9
ii  libyajl2            2.0.4-2
ii  logrotate           3.8.1-1

Versions of packages libvirt-bin recommends:
ii  bridge-utils    1.5-2
ii  dmidecode       2.11-6
ii  dnsmasq-base    2.61-1
ii  ebtables        2.0.9.2-2.1
ii  gawk            1:4.0.1+dfsg-1
ii  iproute         20120319-1
ii  iptables        1.4.13-1.1
ii  libxml2-utils   2.7.8.dfsg-9
ii  netcat-openbsd  1.105-6
ii  parted          2.3-9.1
ii  qemu            1.0.1+dfsg-1
ii  qemu-kvm        1.0+dfsg-11

Versions of packages libvirt-bin suggests:
pn  policykit-1  0.105-1
pn  radvd        <none>

-- no debconf information