[Bug 1100843] Re: Live Migration Causes Performance Issues

[Jonathan Jefferson]

I have a few VMs (precise) that process high-volume transaction jobs
each night.  After I've done a live-migrate operation to replace faulty
power supply on a bare-metal server, we encountered sluggish performance
on the migrated VMs, significant higher CPU is recorded in particular,
where the same nightly job would consume way more CPU and took more time
to finish on identical hardware.

Upon investigation, we noticed that the only change introduced was the
"live migrate" operation. Upon rebooting the guest OS of the VMs, the
performance is back to normal. I suspect we're hitting the same problem
as the one filed here.. I will attempt to  run lmbench next to see if I
would notice similar behavior on system calls costs as the one recorded
in comments #19..21,23.

------
Latest KVM is used from Ubuntu 12.04 LTS :: qemu-kvm (1.0+noroms-0ubuntu14.8)

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to qemu-kvm in Ubuntu.
https://bugs.launchpad.net/bugs/1100843

Title:
  Live Migration Causes Performance Issues

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1100843/+subscriptions