[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [Xen-users] Using the -xen kernel rather than -xen0/U

  • To: "Nicolai Lang" <nicolai@xxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Wed, 4 Apr 2007 12:50:50 +0200
  • Delivery-date: Wed, 04 Apr 2007 03:50:18 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcdwEc45fChF6g82QRuZlDHXjsFGlQGc+YXwAAhDNTA=
  • Thread-topic: [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: 04 April 2007 07:55
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Using the -xen kernel rather than -xen0/U
> Hi all,
> Just installed my first server for real - an amd64 X2 AM2 
> 3000+, which will
> be going into production soon.
> > Not really; the -xen0 or -xen kernels are both suitable to 
> > run in both dom0 and domU.  Unless you need a particular 
> > kernel version or want to run a distro-provided kernel then 
> > I'd suggest that you just use the dom0 kernel (and modules) 
> > in all domains.
> I am concerned about memory use, are the combined -xen kernel 
> not using more
> memory than an optimized? What is the overhead by using the 
> universal module
> kernel compared to compile a static kernel with all needed 
> parts compiled
> directly in?

You're looking at a small amount of extra space used - some megabytes at
the most. 

If you're planning to run many DomU's, then using a stripped down kernel
that only contains what you actually need is a good plan. But since your
system has a single processor at 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?

> Thank you very much in advance, for you comments.
> Best regards
> Nicolai
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.