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[Qemu-devel] [Bug 1458239] Re: Use qed instead of qcow2 for "-snapshot"
[Qemu-devel] [Bug 1458239] Re: Use qed instead of qcow2 for "-snapshot" functionality
Wed, 27 May 2015 12:04:32 -0000
Unless you're using cache=writethrough (which is not the case with
-snapshot), qed has never been faster than qcow2 in a release. qed was
introduced in the same release as qcow2 introduced a writeback metadata
cache which improved performance with cache=none/writeback a lot (qemu
0.14). cache=writethrough gained the same optimisation as qed had with
qcow2's lazy_refcounts, which can optionally be enabled since qemu 1.2.
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Use qed instead of qcow2 for "-snapshot" functionality
Status in QEMU:
AFAIK, qed is better in performance than qcow2, so why we still use
qcow2 for internal snapshots ? patch is trivial.
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