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Interesting

Interesting

Posted Dec 20, 2010 14:39 UTC (Mon) by quotemstr (subscriber, #45331)
In reply to: Interesting by rilder
Parent article: Unmapped page cache control

It's not only possible, but trivial: IO from guests goes through the hypervisor, which can use simple uncached file IO (e.g., O_DIRECT) to service these requests. Host IO goes through the normal path and uses normal buffering.

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Interesting

Posted Jan 3, 2011 5:17 UTC (Mon) by balbir_singh (subscriber, #34142) [Link]

Yes, it is possible, but there have been reports of large overheads in doing so. Please see the email from Chris at http://www.mail-archive.com/kvm@vger.kernel.org/msg30821.... for throughput issues.


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