[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [Bug 1100843] Re: Live Migration Causes Performance Issues

From: Chris J Arges
Subject: [Qemu-devel] [Bug 1100843] Re: Live Migration Causes Performance Issues
Date: Wed, 25 Sep 2013 03:56:21 -0000

** Changed in: qemu-kvm (Ubuntu)
     Assignee: (unassigned) => Chris J Arges (arges)

You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

  Live Migration Causes Performance Issues

Status in QEMU:
Status in “linux” package in Ubuntu:
Status in “qemu-kvm” package in Ubuntu:

Bug description:
  I have 2 physical hosts running Ubuntu Precise.  With 1.0+noroms-
  0ubuntu14.7 and qemu-kvm 1.2.0+noroms-0ubuntu7 (source from quantal,
  built for Precise with pbuilder.) I attempted to build qemu-1.3.0 debs
  from source to test, but libvirt seems to have an issue with it that I
  haven't been able to track down yet.

   I'm seeing a performance degradation after live migration on Precise,
  but not Lucid.  These hosts are managed by libvirt (tested both
  0.9.8-2ubuntu17 and 1.0.0-0ubuntu4) in conjunction with OpenNebula.  I
  don't seem to have this problem with lucid guests (running a number of
  standard kernels, 3.2.5 mainline and backported linux-
  image-3.2.0-35-generic as well.)

  I first noticed this problem with phoronix doing compilation tests,
  and then tried lmbench where even simple calls experience performance

  I've attempted to post to the kvm mailing list, but so far the only
  suggestion was it may be related to transparent hugepages not being
  used after migration, but this didn't pan out.  Someone else has a
  similar problem here -

  qemu command line example: /usr/bin/kvm -name one-2 -S -M pc-1.2 -cpu
  Westmere -enable-kvm -m 73728 -smp 16,sockets=2,cores=8,threads=1
  -uuid f89e31a4-4945-c12c-6544-149ba0746c2f -no-user-config -nodefaults
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -no-kvm-pit-reinjection -no-shutdown -device
  piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
  disk0,format=raw,cache=none -device virtio-blk-
  disk0,bootindex=1 -drive
  ide0-0-0,readonly=on,format=raw -device ide-cd,bus=ide.0,unit=0,drive
  =drive-ide0-0-0,id=ide0-0-0 -netdev
  tap,fd=23,id=hostnet0,vhost=on,vhostfd=25 -device virtio-net-
  -vnc,password -vga cirrus -incoming tcp:
  -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

  Disk backend is LVM running on SAN via FC connection (using symlink
  from /var/lib/one/datastores/0/2/disk.0 above)

  ubuntu-12.04 - first boot
  Simple syscall: 0.0527 microseconds
  Simple read: 0.1143 microseconds
  Simple write: 0.0953 microseconds
  Simple open/close: 1.0432 microseconds

  Using phoronix pts/compuational
  ImageMagick - 31.54s
  Linux Kernel 3.1 - 43.91s
  Mplayer - 30.49s
  PHP - 22.25s

  ubuntu-12.04 - post live migration
  Simple syscall: 0.0621 microseconds
  Simple read: 0.2485 microseconds
  Simple write: 0.2252 microseconds
  Simple open/close: 1.4626 microseconds

  Using phoronix pts/compilation
  ImageMagick - 43.29s
  Linux Kernel 3.1 - 76.67s
  Mplayer - 45.41s
  PHP - 29.1s

  I don't have phoronix results for 10.04 handy, but they were within 1% of 
each other...

  ubuntu-10.04 - first boot
  Simple syscall: 0.0524 microseconds
  Simple read: 0.1135 microseconds
  Simple write: 0.0972 microseconds
  Simple open/close: 1.1261 microseconds

  ubuntu-10.04 - post live migration
  Simple syscall: 0.0526 microseconds
  Simple read: 0.1075 microseconds
  Simple write: 0.0951 microseconds
  Simple open/close: 1.0413 microseconds

To manage notifications about this bug go to:

reply via email to

[Prev in Thread] Current Thread [Next in Thread]