From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Gorm Hansen Subject: Re: Xen and VMware Date: Thu, 17 Feb 2005 01:36:59 -0800 Message-ID: <421465BB.5000400@diku.dk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Steven Hand Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org 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 ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click