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Memory management for virtualizationMemory management for virtualizationPosted Apr 9, 2010 10:36 UTC (Fri) by anton (guest, #25547)In reply to: Memory management for virtualization by avik Parent article: Memory management for virtualization Nested paging makes things worse than what? If it's worse than whatever they do in virtualization without them, why were they introduced?
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Memory management for virtualization Posted Apr 9, 2010 10:43 UTC (Fri) by avik (guest, #704) [Link]
Nested paging has worse cache footprint and tlb fill latency than shadow paging. However shadow paging is a lot worse in terms of scalability and mmu operation costs, so nested paging is an overall win (by a large margin).
So, nested paging is overall much better than shadow paging (but worse in some aspects), large pages bridge the gap and make nested paging better overall.
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