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xen-users
RE: [Xen-users] Using the -xen kernel rather than -xen0/U
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Nicolai Lang
> Sent: 05 April 2007 10:54
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Using the -xen kernel rather than -xen0/U
>
> Hey Mats,
>
> > relatively slow speed, I'd expect you're not planning to run
> > tens or hundreds of guests... ;-) So is the saving of maybe
> > 2-4 megabyte per guest worth the bother of figuring out
> > exactly which options in the kernel you actually need and how
> > to strip off the bits you don't need?
>
> Thanks, if it is only in that amount then I will run with the combined
> kernel (if it aint broke, don't fix it ;) ).
>
> I will be running a max of 10 guests (more like 5-7).
>
> But I have two extra questions that arise as I was playing
> with my first
> guests:
>
> 1)
> The dom0 is of course installed as AMD64 architechture. I was
> considering
> installing the guests as i386, sincen I then will be able to
> run them under
> my spare (3 year old Dell PE 1600) Xeon server.
>
> Is that a sensible choice?
At present (3.0.4), para-virtual guests will need to run at the same
"bitness" as the Dom0, so you either use 64-bit all over, or 32-bit.
HVM (fully virtualized) guests can be whatever bitness is less or equal
to Dom0.
There is little difference between running 32 and 64-bit (most of it is
marginally to the advantage of 64-bit, but unless you really need huge
amounts of memory, I'd say you wouldn't be able to tell any difference
other than by specific benchmarks).
>
> 2)
> I choose the processor because it was on stock, reasonably priced, and
> because it should support HVM
> (http://wiki.xensource.com/xenwiki/HVM_Compatible_Processors),
> but I do not
> see any HVM messages during boot, nor do CPUinfo flags
> contain the vmx flag.
>
> The processor is an AMD Athlon 64 X2 - 3800+ 2.0GHz BOX - AM2 EE, the
> motheboard an Asus M2N-E.
/proc/cpuinfo should contain "svm" (but not "vmx", as that's the Intel
name for their corresponding technology). ["svm" is in your
cpuinfo.txt].
All AM2 processors are HVM compatible except if they are called
"Sempron".
--
Mats
>
> Have I made a blunder? Does the HVM demand a certain motherboard? I'm
> attaching cpuinfo and dmesg
>
> Thank's in advance.
>
> Best regards
> Nicolai
>
>
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