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Re: [Xen-devel] Measuring migration downtime


  • To: "Anthony Liguori" <aliguori@xxxxxxxxxx>
  • From: harish <mvharish@xxxxxxxxx>
  • Date: Fri, 9 Jun 2006 11:43:33 -0700
  • Cc: Arun Babu <arunbabu.n@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Fri, 09 Jun 2006 11:43:54 -0700
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Could you pls suggest any benchmarks that might have been used in the past to do exactly this?
thanks
hmv

On 6/8/06, Anthony Liguori < aliguori@xxxxxxxxxx> wrote:
Arun Babu wrote:
> Hi,
>  I need to get the exact downtime for doing a live migration with ms
> precision.
>  (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.

If you run a benchmark against the server, and measure the server's
throughput at a high granularity and graph it, it should show you the
interval that it was down for.  I think that is the most realistic way
to do this.

Regards,

Anthony Liguori

>  Can you suggest me ideas to measure this?
>
> Thank you,
> Arun
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