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THP is also useful for KVM virtual machines as well as other baremetal workloads.
It's available in RHEL6 today, backported into 2.6.32

There's some info posted on line from the kvm forum
Slides...

Wrong.
SQLite didn't run faster under VM than native.
You're just seeing misleading results because the host was caching.

Testing it on Ubuntu probably won't yield the best results.
You might want to try on RHEL 5.4 where it's been optimized or even on Fedora 11/12

There's lots of optimizations to look at, from...

It's not a virtualization bug it's a flaw in the testing.
What's happening is that the host is caching the writes so the data is not being written right away so it would appear to be faster.

Consistency in testing?

I was looking through the recent set of tests (vs Mac, vs Fedora, vs OpenSolaris, etc) I'm surprised to see that there doesn't seem to be a consistent set of test results...