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This is the comment you were replying to, attached to the article Choice for Virtual Private Servers?:
#22 Re: Choice for Virtual Private Servers? Posted by grifferz (82.44.xx.xx) on Fri 13 Jan 2006 at 11:11 Xen is "low overhead" in the sense that apart from enforcing the segmentation of the code from different domains, there is no emulation; i.e. the software runs on the bare metal. Because of that there is very little performance loss compared to running the software under an unpatched Linux kernel. If vserver fits all your needs then it would be more efficient in terms of disk space and RAM to use that, but obviously these are different types of virtualisation and Xen does provide more partitioning. Andy
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