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Re: [Xen-devel] Measuring migration downtime

  • To: "Arun Babu" <arunbabu.n@xxxxxxxxx>
  • From: "Jacob Gorm Hansen" <jacobg@xxxxxxx>
  • Date: Sun, 11 Jun 2006 16:54:53 +0200
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 11 Jun 2006 07:55:14 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On 6/9/06, Arun Babu <arunbabu.n@xxxxxxxxx> wrote:

 I need to get the exact downtime for doing a live migration with ms
 (I am not bothered about whole migration time which is close to 1 minute..
I need to measure
 the live migration downtime during which the DomU is out of service.. the
figure quoted in the xen
 documentation says it as ~60 ms..  )
 I hope someone must have tried to measure this before.

What about the methods and results in our NSDI 2005 paper, don't they
tell you what you need?

You can use in tcpdump on an independent machine and log timestamps of
packets send from the migrating domain's IP, in response to fx a

You can also sync the two machine's clocks using NTP and instrument
the tools to measure timestamp of domain suspend resp. resume.


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