Re: [Xen-users] Xen Performance

["Olivier B." <xen.list@xxxxxxxxx>]

Hi,

are you comparing a Xen mounted on LVM with a "normal" FS not mounted on 
LVM ?
As LVM disable barrier, there can be a performance improvement.

Olivier

Amir Maqbool Ahmed a écrit :
> Hi 
>
> 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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