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[Qemu-devel] linux aio and cache mode
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Subject: |
[Qemu-devel] linux aio and cache mode |
Date: |
Mon, 24 Sep 2012 19:32:46 +0800 |
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Mozilla/5.0 (X11; Linux x86_64; rv:10.0.7) Gecko/20120911 Thunderbird/10.0.7 |
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
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