Re: [Xen-users] Xen Performance

Olivier B.
Tue, 26 May 2009 14:21:27 -0000

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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