Re: [Xen-users] major slow down with xen implementation

["Grant McWilliams" <grantmasterflash@xxxxxxxxx>]

On Thu, Sep 25, 2008 at 10:16 AM, Javier Guerra <javier@xxxxxxxxxxx> wrote:

On Thu, Sep 25, 2008 at 11:55 AM, Geoffrey <lists@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Can't para-virtualize.  Running 64bit on the hardware so as to get access to
> the full 32GB memory.  Running 32bit virtuals, because we have a third party
> app that won't run on 64bit.  I know...

it's not easy to write a 32bit app that won't run when the needed
libraries are there; but i guess you're already tired of analysing ldd
output.

--
Javier

I'd assume that you've tried providing the relevant 32 bit libraries for the app but it's dangerous to assume anything so I won't. You can get most
32 bit apps to run on 64 bit if you have both 32 bit and 64 bit libs available. I think it's worth the effort. But again you've probably already gone down
this route.  The overhead for HVM is quite a bit higher than PV.

Also according to the Xensource wiki you can install a 32bit PAE PV on a 64bit DomU Hypervisor with Xen 3.1 and greater.

	32bit Hypervisor	64bit Hypervisor
32bit PV DomU	Yes	Yes (starting from Xen 3.1), kernel must be PAE
64bit PV DomU	No	Yes
32bit HVM DomU	Yes	Yes
64bit HVM DomU	No	Yes

http://wiki.xensource.com/xenwiki/XenFaq#head-5f7176b3909cb0382cece43a6a8fc25a3a114e93

It's easy to install Xen 3.3 on CentOS 5 x86_64 if you use the rpms... Don't know which distro you're using.

--
Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.

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