Consolidation and CKRM

Consolidation and CKRM

Posted Jul 24, 2005 21:46 UTC (Sun) by stephen_pollei (guest, #23348)
Parent article: OLS: Xen and UML

Class-based Kernel Resource Management (CKRM) might also be a consolidation enabler. It might also be a little bit faster as it has more information to use then a virtual machine monitor will have.
Gerrit Huizenga at IBM has said "And yes, a hypervisor does have a lot more overhead in many forms. Something like an overall 2-3% everywhere, where the CKRM impact is likely to be so small as to be hard to measure in the individual subsystems, and overall performance impact should be even smaller. Plus you won't have to manage each operating system instance which can grow into a pain under virtualization. But I still maintain that both have their place."
Alan Cox has said "Its more expensive to do a lot of resource management at the VMM level because the virtualisation engine doesn't know anything but its getting indications someone wants to be bigger/smaller. ... Bingo - and areas the virtualiser can't see into, at least not unless it uses the same hooks CKRM uses."
So both virtualization and partitioning will be important.

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