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Randy Thelen on Monday 20 Mar 2006 12:45 wrote:
> Ritesh Raj Sarraf wrote:
>
>> 1) If I patch my kernel with Xen, will I be compromising on any of
>> the other
>> features that I've patched ? (Namely UML and swsusp. I use UML a lot)
>
> swsusp: Software Suspend
> http://sourceforge.net/projects/swsusp
>
> It's unlikely this will work with Xen. This would undoubtedly
> require a patch into the Xen hypervisor to save & restore the other
> domains. Even if you were only running dom0, this might still not work.
>
> UML: User Mode Linux
> Interesting. UML is a technology which accomplishes some of the same
> goals as Xen. Xen can run multiple instances of Linux, like UML. So
> from that stand point, you'll get many of the same features as UML.
> However, Xen can also run other operating systems: FreeBSD, NetBSD,
> Minix (in theory), Windows XP (with the right processor), etc.
>
Thanks for replying.
Basically I'm looking to build the kernel with all support.
I want a kernel with Xen support which I can use for UML too when I'm not
running any other domU (other OSes in Xen) want.
Right now my kernels are patched with UML but I don't use UML always. I use
it only when I want, else my machine runs as a normal machine.
> It's my opinion that Xen is a superset of the functionality one can
> get with UML. If UML is important to you, I encourage you to
> continue learning about the virtues of Xen.
>
> The answer to the question: "will I be compromising on any of the
> other features?" is yes.
>
>> 2) So when I boot with a Xen kernel, the OS it boots into is dom0
>> which
>> simply is my normal OS. Right ?
>
> More or less. However, the Linux running as dom0 will likely not be
> the same -kernel- image that you are currently running. But, it will
> be Linux and it will see your current file systems, devices (assuming
> your configuration files are suitably identical), etc.
>
So basically it'd be the same kernel with Xen features?
>> 3) If I'm correct about Question 2 then, "when only using dom0,
>> does it add
>> any virtualization overhead to the host OS i.e. dom0 ? Or does it
>> simply
>> function as a normal Linux Kernel with Xen features not being in
>> use ? "
>
> It does add overhead to use Xen even with only dom0 present, but
> they're minimal. It's likely you won't notice them. Various
> presentations indicate the performance impact is as low as 3%.
>
> -- Randy
That's good. 3% overhead is worth trying Xen.
:-)
Thanks,
Ritesh
- --
Ritesh Raj Sarraf
RESEARCHUT -- http://www.researchut.com
"Necessity is the mother of invention."
"Stealing logic from one person is plagiarism, stealing from many is
research."
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