qcow2: Improve cluster refcount update
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Cover letter [Qemu-devel] [PATCH 0/4] qcow2: Improve cluster refcount update
This series of patches improves qcow2 performance with O_DIRECT when the qcow2 file is empty and we begin to fill it.
For instance, an OS install took 12 min 56 sec without these patches, and 8 min 37 sec with it (this has been measured with KVM).
To do that, they improve the updating of the clusters refcounts.
[PATCH 1/4] qcow2: Clean-up update_cluster_refcount(). [PATCH 2/4] qcow2: Allow update_cluster_refcount() to update several
clusters refcount.
[PATCH 3/4] qcow2: Align I/O access to l2 table and refcount block. [PATCH 4/4] qcow2: detect if no disk cache
Laurent
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