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5 <h1>The fix: raise the victory flag</h1>
8 QEMU 4.0 added <code>BDRV_REQ_NO_FALLBACK</code> to detect if
9 zeroing is fast, and automatically utilizes it during 'qemu-img
12 <li>No support for flag: avoid pre-zeroing
13 <li>Flag supported and succeeds (for O(1) implementation):
15 <li>Flag supported but fails (for O(n) implementation): no penalty
19 <img src="4500-graph.png" width="70%" style="display: block; margin: auto;"/>