[Vserver] Re: [parisc-linux] syscall number for vserver

[Herbert Poetzl]

On Fri, Dec 19, 2003 at 09:11:34AM -0700, Grant Grundler wrote:
> On Fri, Dec 19, 2003 at 04:24:56AM +0100, Herbert Poetzl wrote:
> ...
> 
> That should be part of the patch to enable vserver.
> 
> > > BTW, I visited http://www.linux-vserver.org/ and didn't feel
> > > I understood why it's more useful than say, user mode linux
> > > (another form of virtualization) or vPARs. 
> > 
> > hmm, for UML you'll need a kernel for each vps,
> > which eats up a lot of resources, where vserver
> > even allow you to share the files between vps
> 
> Has anyone bothered to quantify how much resource?
> In general, systems are memory starved, so this sounds
> like a good thing.

well, just as a small example, a single CPU
2GHz Pentium machine with 1GB RAM works reasonably
well with 30-40 vservers, each one running sshd, 
apache, php, postfix and mysql ...
 
a dual CPU 1.5GHz machine with 2GB RAM can
provide shelter for about 60-80 vservers, with
good responsiveness ...

a test patch for 2.4.23-pa3 can be found at
http://vserver.13thfloor.at/Stuff/patch-2.4.23-pa3-vs1.22.diff
(tools need some tweaking ...)

> > regarding vPARs, I didn't know that they work
> > for Linux yet, can you give some hints on that?
> 
> Search for "vPARs" on www.hp.com if you want more details
> on HPUX vPARs support.

heard of it for HPUX, and it seems that XEN
is somewhat compareable to that, but that didn't
answer my question: are they available for Linux
or 'just' for HPUX?

TIA,
Herbert

> grant