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 hypervisors. 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 > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > http://lists.centos.org/mailman/listinfo/centos-virt > -- Lucas Timm, Goiânia/GO. http://timmerman.wordpress.com (62) 8198-0867 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20101019/efb20beb/attachment-0006.html>