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Re: [Xen-users] Xen Performance

To: Amir Maqbool Ahmed <AmirM.Ahmed@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen Performance
From: Peter Booth <peter_booth@xxxxxxx>
Date: Thu, 28 May 2009 12:57:45 -0400
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The 8% is a dangerous over-simplification, and represents simply the results of a particular well-designed study. Clearly there are situations where the overhead of using Xen is much higher than this.

On May 24, 2009, at 6:12 AM, Amir Maqbool Ahmed wrote:


I am a student at the University College of Oslo and have in one experiment tried to test the performance of Xenolinux compared to Native linux on Debian lenny
2.6.26-2 kernel.

bonnie++ the disk IO bechmark program was used among other tests like cpu intensive scripts. The goal is to prove the statement (Once again) that Xen adds only an overhead of maximum 8%.

The Results of bonnie++ have been surprizing and I want to explain them. It shows that for some types of Disk IO, like sequential delete and random create Xen performs faster than native linux. A full comparison chart is attached as a pdf. The test are run first from native linux than both from Dom0 and a DomU with the same results.

Can you please help me understand these results, How can Xenolinux perform faster
although only for some types of operations, then native linux?

Plese forgive me If Im missing something completely obvious.
If you need any further info. please just send me an email and it will be provided.

Hope to hear from you soon

Amir Ahmed
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