erofs-freebsd-out-tree/tests/TC105-zstd-level1.md

Test Case: zstd Compression Level 1

Test ID: TC105-zstd-level1

G5 fixture contract: Use G5-MANUAL-SETUP.md. Its generated paths, source comparisons, structured corruption offsets, and cleanup rules supersede placeholder examples in this file. Category: Compression
Priority: High
Regression: None

Objective

Verify zstd compressed data path with level 1 (fastest) compression.

Preconditions

• EROFS image created with zstd level 1: mkfs.erofs -zzstd,level=1 test.img src/
• Test files of various sizes
• FreeBSD 13.0+ with libzstd

Test Steps

1. Create image with zstd level 1 compression
2. Attach and mount: unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt
3. Read files and verify content
4. Test random access patterns
5. Measure throughput

Expected Results

• All files decompress correctly
• Fast decompression speed
• Good compression ratio even at level 1
• Random access works correctly

Verification Method

• SHA256 checksums match originals
• Decompression throughput > 200 MB/s
• No zstd decompression errors
• Random reads succeed

Cleanup

umount /mnt
mdconfig -d -u "${unit}"

Notes

Tests feature 59: zstd compressed data path with fast compression.