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Added some comments over lfs_config's fragment_size/crystal_thresh/etc

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Also added related asserts to lfs_init.

Note the fragment_size <= block_size/8 limit is to avoid wasteful corner
cases where only one fragment can fit in a block. The shrub_size <=
block_size/4 limit is looser because of how shrubs temporarily
overcommit.

As for the other limits, inline_size is bounded by shrub_size, and
crystal_thresh technically doesn't have a limit, though values >
block_size stop having an effect.
This commit is contained in:
Christopher Haster
2024-05-13 21:49:25 -05:00
parent a9f6b6e903
commit f5beacf6ee
4 changed files with 33 additions and 3 deletions
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runners/bench_runner.h
+1 -1
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@@ -119,7 +119,7 @@ void bench_permutation(size_t i, uint32_t *buffer, size_t size);
lfs_max(16, lfs_max(READ_SIZE, PROG_SIZE))) \
BENCH_DEFINE(INLINE_SIZE, BLOCK_SIZE/4 ) \
BENCH_DEFINE(SHRUB_SIZE, INLINE_SIZE ) \
BENCH_DEFINE(FRAGMENT_SIZE, CACHE_SIZE ) \
BENCH_DEFINE(FRAGMENT_SIZE, BLOCK_SIZE/8 ) \
BENCH_DEFINE(CRYSTAL_THRESH, BLOCK_SIZE/8 ) \
BENCH_DEFINE(LOOKAHEAD_SIZE, 16 ) \
BENCH_DEFINE(BLOCK_CYCLES, -1 ) \