[Bug 741887] Re: virsh snapshot-create too slow (kvm, qcow2, savevm)

[Kevin Wolf]

In qemu 0.14 cache=writeback and cache=none are expected to perform
well. The default cache=writethrough is a very conservative setting
which is slow by design. I'm pretty sure that it has always been slow,
even before 0.12.5.

I think that the specific problem with savevm may be related to the VM
state being saved in too small chunks. With cache=writethrough this will
hurt most.

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https://bugs.launchpad.net/bugs/741887

Title:
  virsh snapshot-create too slow (kvm, qcow2, savevm)