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[unstable2507] Backport #9875 #9879

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Merged
ggwpez merged 2 commits into from
Sep 30, 2025
Merged

[unstable2507] Backport #9875 #9879

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c1b3110
Stronger WASM compression
ggwpez Sep 29, 2025
576fcf7
pdoc
ggwpez Sep 30, 2025
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9 changes: 9 additions & 0 deletions prdoc/pr_9875.prdoc
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
title: Stronger WASM compression
doc:
- audience: Runtime Dev
description: |-
Use strongest compression 22 instead of just 3. See [docs](https://docs.rs/zstd/0.13.3/zstd/stream/write/struct.Encoder.html#method.new).
Reduces our KAH compressed size by 25%.
crates:
- name: sp-maybe-compressed-blob
bump: patch
2 changes: 1 addition & 1 deletion substrate/primitives/maybe-compressed-blob/src/lib.rs
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Expand Up @@ -91,7 +91,7 @@ pub fn compress(blob: &[u8], bomb_limit: usize) -> Option<Vec<u8>> {
let mut buf = ZSTD_PREFIX.to_vec();

{
let mut v = zstd::Encoder::new(&mut buf, 3).ok()?.auto_finish();
let mut v = zstd::Encoder::new(&mut buf, 22).ok()?.auto_finish();
v.write_all(blob).ok()?;
}

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