<div><div>Hi guys,</div><div><br></div><div>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.</div>
<div><br></div><div>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.</div>
</div><div><br></div><div><br><br><div class="gmail_quote">2010/10/19 Jerry Franz <span dir="ltr"><<a href="mailto:jfranz@freerun.com" target="_blank">jfranz@freerun.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div> On 10/19/2010 03:47 AM, Dennis Jacobfeuerborn wrote:<br>
> On 10/19/2010 09:41 AM, Pasi Kärkkäinen wrote:<br>
>><br>
</div><div>>> It's because of the x86_64 architecture, afaik.<br>
>><br>
>> There was some good technical explananation about it,<br>
>> but I can't remember the url now.<br>
> In that case I'll have to call this advice extremely bogus and you probably<br>
> should refrain from passing it on. The only way I can see this being true<br>
> is some weird corner case.<br>
</div>There appear to be some interactions with the Intel VT-d processor features.<br>
<br>
<a href="http://www.xen.org/files/xensummit_intel09/xensummit2009_IOVirtPerf.pdf" target="_blank">http://www.xen.org/files/xensummit_intel09/xensummit2009_IOVirtPerf.pdf</a><br>
<br>
If I understand that paper correctly, HVM+VT-d outperforms PV by quite a<br>
lot (if you have VT-d support on your system).<br>
<font color="#888888"><br>
--<br>
Benjamin Franz<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Lucas Timm, Goiânia/GO.<br><a href="http://timmerman.wordpress.com" target="_blank">http://timmerman.wordpress.com</a><br><br>(62) 8198-0867<br>
</div>