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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-04 21:39:21 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-04 21:39:21 +0000
commit4dc822d726376fd4369089f04eb8605d2f94b74f (patch)
tree743ea1d2ed14426c2d9f3da8d48d24b14f990df0 /d3des.h
parent0cd2df75a2d7223b567c0eaa2547ce6c7d6a83f7 (diff)
Use writeback caching by default with qcow2
qcow2 writes a cluster reference count on every cluster update. This causes performance to crater when using anything but cache=writeback. This is most noticeable when using savevm. Right now, qcow2 isn't a reliable format regardless of the type of cache your using because metadata is not updated in the correct order. Considering this, I think it's somewhat reasonable to use writeback caching by default with qcow2 files. It at least avoids the massive performance regression for users until we sort out the issues in qcow2. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5879 c046a42c-6fe2-441c-8c8c-71466251a162
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