[CentOS-virt] performance differences between kvm/xen

Tue Oct 19 12:21:38 UTC 2010
Lucas Timm LH <linuxhelper at gmail.com>

Hi guys,

Sorry by late reading this thread. I had already compared Xen Source with
KVM (and btw, VMware Server 2) in CentOS 5.2 days (2008) for a college job.
At this time Xen have more performance than the others, but I'd tested in my
desktop: A Core 2 Duo E6420 with 3GB Ram. All the papers I'd used is
available in brazilian portuguese, if anyone is interesed I would send. But
*IMHO* isn't interesting translating the job to english because, as I said,
I did it in CentOS 5.2 (2008) and a *LOT* things has changed in all this

Anyway, here in my job I have two IBMs x3400 (two Xeon 5504 sockets with 8GB
Ram and 2 x 160GB [SAS? SATA? I really don't know]) available, and they
works perfect with Xen and KVM (both worked as Dom0 before, so we replaced
them for rack mounted machines). I really like x86 virtualization, so I can
test the hypervisors again in this real servers and write about it in my
free time, but I need a metodology to follow up and do a benchmark. (I'm not
good in performance metter). If someone else is interesed in do it with me,
will be really fun.

2010/10/19 Jerry Franz <jfranz at freerun.com>

>   On 10/19/2010 03:47 AM, Dennis Jacobfeuerborn wrote:
> > On 10/19/2010 09:41 AM, Pasi Kärkkäinen wrote:
> >>
> >> It's because of the x86_64 architecture, afaik.
> >>
> >> There was some good technical explananation about it,
> >> but I can't remember the url now.
> > In that case I'll have to call this advice extremely bogus and you
> probably
> > should refrain from passing it on. The only way I can see this being true
> > is some weird corner case.
> There appear to be some interactions with the Intel VT-d processor
> features.
> http://www.xen.org/files/xensummit_intel09/xensummit2009_IOVirtPerf.pdf
> If I understand that paper correctly, HVM+VT-d outperforms PV by quite a
> lot (if you have VT-d support on your system).
> --
> Benjamin Franz
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> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt

Lucas Timm, Goiânia/GO.

(62) 8198-0867
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