From: Jacob Gorm Hansen <jacobg@diku.dk>
To: Steven Hand <Steven.Hand@cl.cam.ac.uk>
Cc: xen-devel@lists.sourceforge.net
Subject: Re: Xen and VMware
Date: Thu, 17 Feb 2005 01:36:59 -0800 [thread overview]
Message-ID: <421465BB.5000400@diku.dk> (raw)
In-Reply-To: <E1D1hkB-0007Oc-00@mta1.cl.cam.ac.uk>
Steven Hand wrote:
>>VMWare does some amount of paravirtualization, with all the VMWare tools
>>that you need to install. In fact, Xen seems to be going in VMWare's
>>direction (shadow page tables, writable page tables, binary rewriting,
>>Vanderpool support) in some areas.
>
> Hmm:
>
> - our shadow page tables are quite different to VMware's (as far as
> we can tell - there's no docs on their implementation details)
>
> - I don't think that writable page tables are something VMWare do
> since it only makes sense for paravirtualized memory systems.
>
> - our binary rewriting is a tiny fraction of what they do and, in
> current default installs of xen 2.x, is not used at all.
>
> - we released VT support back in 2004; I don't believe VMWare
> ship anything supporting VT at present.
What I meant by that is that where Xen1 was purely in the paravirt camp,
recent versions take more of a middle-of-the road stance, as Xen now
sports functionality that does not strictly _have_ to be in the VMM, and
does so in order to reduce the porting effort for new guest OSes.
Jacob
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next prev parent reply other threads:[~2005-02-17 9:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-16 22:05 Xen and VMware Tom Hibbert
2005-02-16 22:50 ` Jacob Gorm Hansen
2005-02-17 2:40 ` aq
2005-02-17 3:01 ` Jacob Gorm Hansen
2005-02-17 9:14 ` Steven Hand
2005-02-17 9:36 ` Jacob Gorm Hansen [this message]
2005-02-17 15:51 ` Ronald G. Minnich
2005-02-17 16:32 ` B.G. Bruce
-- strict thread matches above, loose matches on Subject: below --
2005-02-16 15:08 Tim Freeman
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