RE: Réf. : [Xen-ia64-devel] Time for hybridvirtualization?

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

following is my thinking, it may be wrong.

 

If we want to run dom0 on VTi, we still need to support of paravitualization, madison is still being used.

We can have two branch, one VT-i dom0, the other is para dom0.

We may focus on VT-i dom0 branch.

While we still support para dom0, if there are bugs, we need to fix it, but we will not update xenolinux to new release version, we just try to make all functions work well.

 

In the other side, It's impossible Redhat would like to maintain two modified linux version, one is for hybrid, the other is for para.

Redhat may choose modified linux version for hybrid, it is more easier for maintain.

 

 

Thanks,

- Anthony

 

 

 

 

---

From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of jean-paul.pigache@xxxxxxxx
Sent: 2008年1月17日 19:05
To: Alex Williamson
Cc: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx; xen-ia64-devel
Subject: Réf. : [Xen-ia64-devel] Time for hybridvirtualization?

Alex and all, 

we, in Bull,  are using Xen-ia64 to provide logical 
partitioning for Linux physical partitions in our mainframe systems running on 
Itanium. 
Some of these systems have been 
delivered with Madison CPUs which are non-VT. 
So I would vote for keeping the support of paravirtualization. 

On the technical side, I agree with the 
long-term objective, but performance is a major point and I think we should not 
discard paravirtualization until we have verified that there is no performance 
regression with most of the CPUs installed in Itanium systems. 
Knowing that performance will be better with Tukwila is a 
valuable information for a long term objective but Tukwila is not what is 
installed to-day. 
So my opinion is that 
removing paravirtualization may be a good choice for the long term, but deciding 
to do it now is premature. 

Best 
regards 
Jean-Paul

Alex Williamson <alex.williamson@xxxxxx> Envoyé par : xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 17/01/2008 01:02

Pour :        xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>         cc :                 Objet :        [Xen-ia64-devel] Time for hybrid virtualization?

  Is it possible?  Is it a good idea?  What are 
some of the issues?  We
would lose support for non-VT capable processors 
(pre-Montecito), but is
that so bad?  Is it a "fast track" to upstream 
Linux Xen/ia64 support?
Let me know your thoughts. 
 Thanks,

                
Alex

[1] 
http://ols.108.redhat.com/2007/Reprints/nakajima-Reprint.pdf

-- 
Alex 
Williamson                     
        HP Open Source & Linux 
Org.


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