[Qemu-devel] linux aio and cache mode

[ching]

Hi all,

My host is qemu-1.1.1 and x64 kernel 3.5.4. The guest is using aio="native"

I am trying to use unsafe cache mode to boost i/o performance.

After googling a while, there are some old web page telling that linux native 
aio do not use host cache. 
(http://stackoverflow.com/questions/5664105/buffered-asynchronous-file-i-o-on-linux)

is it still valid for recent kernel? do i need to change to aio="threads" to 
take advantage of unsafe cache mode?

Thanks in advance.

Regards,
ching