Re: [Xen-users] Looking for Xen success stories in a production data center environment

[Peter Booth <peter_booth@xxxxxxx>]

QqpI have real production data, some ppsitive, some negative. What is  
your context?
Are you talking about web app or batch?
Are you most concerned about throughput or respense time?
Are you concerned with self-managed or VPS/cloud environments?

The near-native observations you made don't tell the whole story. My  
experience is that most production applications are built and deployed  
in unoptimized states such that over-resourcing is the norm. A cost  
that's unique to virtualization is the erratic latencies due to  
hypervisor scheduling algorithm. In one example a rails app with  
consistent response times of 400ms native showed response times of  
400msec to 3sec virtualized, depending on %steal values. There are a  
couple of recent papers reporting similar data.
Sent from my iPhone
App
On May 11, 2009, at 11:11 AM, Joe Armstrong <Joe.Armstrong@xxxxxxxxx>  
wrote:
> Pasi KÃrkkÃinen wrote:
> > Hopefully someone can come up with benchmarks/numbers.
> >
> > You could always run your own benchmarks? :-)
> Yes - I did that first thing... and got number for  both disk and  
> network
> I/O to within 1 or 2 % of native... nice.
>
> But, my little setup is not even close to a "real data center"  
> setup, and no
> way I can get stability data in a few days of running small tests.   
> I was
> hoping somebody (Oh, I don't know, maybe from Amazon...) would cough  
> up some
> really good data on stability & I/O performance.  Or maybe somebody  
> out
> there would know where to find it.  I'm looking but not a lot of  
> luck so
> far.  But if I find some I'll post it.
>
> Thanks.
>
> Joe
> --
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>
>
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