Zstd flat always delta encode#2478
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cary-ilm merged 1 commit intoJun 18, 2026
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Signed-off-by: Vlad Lazar <vlazar@ilm.com> (cherry picked from commit 3223e18)
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Enable delta encoding for flat images.
Without delta encode:
Zstd vs Zips:
Size : 1.069
Write: 0.518
Read : 1.002
With delta encode:
New Zstd vs Zips:
Size : 0.962
Write: 0.631
Read : 1.002
Seems ZIPS always delta encodes flat images. This helps more flat than deep. I still did encounter images where delta did not help, but over the 7000 test images, it helps by about 9% ( goes from being 6% worse than ZIPS to 3% better than zips).
Compression speed suffers slightly.