Re: [Xen-users] Re: Will pv-ops dom0-patched kernel be eventually merged into Linus Torvalds' mainline Linux kernel tree?

[Itamar Reis Peixoto <itamar@xxxxxxxxxxxxxxxx>]

you can setup kvm networking as bridge like xen.

will work both in the same way.


On Tue, Nov 10, 2009 at 4:27 AM, Mr. Teo En Ming (Zhang Enming)
<space.time.universe@xxxxxxxxx> wrote:
> One of the reasons why I prefer Xen over KVM is because of networking.
>
> I have a Gigabit network card on my Intel DQ45CB motherboard. I don't see a
> need to install an additional network card on my motherboard as PCI and PCIe
> expansion slots are limited.
>
> In the case of Xen, the physical network interface in my host operating
> system (dom0) and the virtual network interfaces in my guest operating
> systems (domU) can be added to the same ethernet bridge on the host OS. This
> implies that my host and virtual machines will have IP addresses in the same
> subnet. Moreover, if I do not want to configure static IP addresses, my
> virtual machines (VMs) can obtain IP adddresses from the DHCP server on
> commercial routers like Linksys, D-Link, Netgear, etc, similar to the way
> the physical network card on the host obtaining its IP address from the same
> router.
>
> But, for the case of KVM, I need to setup an internal network for my guests.
> This implies that my guests will use a different subnet from the host. In
> order for my guests to have internet connectivity, I need to create an
> ethernet bridge on the host OS and configure it as the default
> gateway/router for my guests. Then I need to setup source network address
> translation (SNAT) for the virtual network interfaces in my guests. The
> virtual network interfaces in my virtual machines cannot obtain IP addresses
> from my Linksys, D-Link, Netgear routers. If I want to run services like
> HTTP servers on my guests, I need to setup destination network address
> translation (DNAT) *twice*, first from my commercial router to my host OS,
> but my host is also a router for the internal network of my virtual
> machines, hence I have to port forward a second time from my host OS to my
> guest machines.
>
> Fortunately, in the case of Xen, I would only have to setup DNAT once, from
> the commercial router to my virtual machine.
>
> For the purpose of my argument for Xen vs KVM networking, please refer to
> the following article:
>
> Qemu (kvm) internal network setup
>
> Link: http://blog.cynapses.org/2007/07/12/qemu-kvm-internal-network-setup/
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe@xxxxxxxxx
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>
> On Tue, Nov 10, 2009 at 1:29 PM, Mr. Teo En Ming (Zhang Enming)
> <space.time.universe@xxxxxxxxx> wrote:
>>
>> After reading the following articles, it doesn't sound very hopeful for
>> Xen.
>>
>> [1] Xen vs. KVM: Verdict still out on dueling hypervisors
>>
>> http://searchdatacenter.techtarget.com/news/article/0,289142,sid80_gci1368664,00.html
>>
>> [2] Xen vs. KVM Linux virtualization hypervisors
>>
>> http://searchservervirtualization.techtarget.com/generic/0,295582,sid94_gci1371226,00.html
>>
>> [3] Xen vs. KVM: The Linux Foundation’s Small-Minded View of
>> Virtualization
>>
>> http://windowsconnected.com/blogs/brad/archive/2009/04/17/xen-vs-kvm-the-linux-foundation-s-small-minded-view-of-virtualization.aspx
>>
>> What are your views? I certainly hope that pvops dom0 patches would be
>> merged into the mainline Linux kernel.
>>
>> --
>> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
>> Engineering)
>> Alma Maters:
>> (1) Singapore Polytechnic
>> (2) National University of Singapore
>> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
>> My Secondary Blog: http://enmingteo.wordpress.com
>> My Youtube videos: http://www.youtube.com/user/enmingteo
>> Email: space.time.universe@xxxxxxxxx
>> Mobile Phone (Starhub Prepaid): +65-8369-2618
>> Street: Bedok Reservoir Road
>> Country: Singapore
>
>
>
>
>
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>



-- 
------------

Itamar Reis Peixoto

e-mail/msn/google talk/sip: itamar@xxxxxxxxxxxxxxxx
skype: itamarjp
icq: 81053601
+55 11 4063 5033
+55 34 3221 8599

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