Messages in this thread | | | Date | Fri, 30 Apr 2004 15:47:44 -0400 | From | Shailabh <> | Subject | Re: [ckrm-tech] Re: [RFC] Revised CKRM release |
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Rik van Riel wrote: > On Fri, 30 Apr 2004, Christoph Hellwig wrote: > > >>I'd hate to see this in the kernel unless there's a very strong need >>for it and no way to solve it at a nicer layer of abstraction, e.g. >>userland virtual machines ala uml/umlinux. > > > User Mode Linux could definitely be an option for implementing > resource management, provided that the overhead can be kept > low enough. > > For these purposes, "low enough" could be as much as 30% > overhead, since that would still allow people to grow the > utilisation of their server from a typical 10-20% to as > much as 40-50%. >
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/performance.html
has some numbers comparing native Linux to UML (and against the Xen virtual machine monitor) but its on a 2.4 kernel.
Jeff, do you have any numbers for UML overhead in 2.6 ?
-- Shailabh
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