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InterestingInterestingPosted Dec 20, 2010 14:32 UTC (Mon) by rilder (subscriber, #59804)In reply to: Typo by quotemstr Parent article: Unmapped page cache control
I don't think that is possible -- to be able to differentiate requests from the host and the guest to serve uncached to guest and cached to host -- if this is possible then it is great.
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Interesting Posted Dec 20, 2010 14:39 UTC (Mon) by quotemstr (subscriber, #45331) [Link]
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.
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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