Thanks for reporting this bug.
Could you change the cache=writeback to cache=none, and see if that improves
the performance?
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided => High
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1039166
Title:
high use of resource
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