Awful FreeBSD 9 block IO performance in KVM

[Ivan Voras]

On 19/07/2012 20:27, Richard Yao wrote:
> Dear Everyone,
> 
> FreeBSD 9 has awful block IO performance in KVM. I have experienced it
> and others have experienced it. Someone posted slides to slideshare with
> benchmarks documenting it:
> 
> http://www.slideshare.net/TakeshiHasegawa1/runningfreebsdonlinuxkvm
> 
> Slides 13 and 20 are particular eye openers. Does anyone know what is wrong?

I'm interested in seeing if the difference is still large while writing
to a raw device (dd of=/dev/xxx bs=1m count=1000) vs writing to the file
system. Can you test this?

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