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| author | Wang Shilong <wshilong@ddn.com> | 2020-09-15 15:06:11 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2021-01-25 15:18:45 -0500 |
| commit | 9226b3264b74044013f4933280b1989c33be42f3 (patch) | |
| tree | b3b7ef05cf011adf5ea0af6723057151022d2ad9 | |
| parent | ed2cec54da604efe1af2734182985d1730674138 (diff) | |
| download | e2fsprogs-9226b3264b74044013f4933280b1989c33be42f3.tar.gz | |
e2fsck: make default smallest RA size to 1M
If we have a smaller inodes per group, default ra size could
be very small(etc 128KiB), this hurts performances.
Tune above 128K to 1M, i see pass1 time drop down from
677.12 seconds to 246 secons with 32 threads.
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | e2fsck/readahead.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/e2fsck/readahead.c b/e2fsck/readahead.c index 38d4ec422..40b736644 100644 --- a/e2fsck/readahead.c +++ b/e2fsck/readahead.c @@ -234,6 +234,8 @@ int e2fsck_can_readahead(ext2_filsys fs) return err != EXT2_ET_OP_NOT_SUPPORTED; } +#define MIN_DEFAULT_RA (1024 * 1024) + unsigned long long e2fsck_guess_readahead(ext2_filsys fs) { unsigned long long guess; @@ -245,6 +247,8 @@ unsigned long long e2fsck_guess_readahead(ext2_filsys fs) * in e2fsck runtime. */ guess = 2ULL * fs->blocksize * fs->inode_blocks_per_group; + if (guess < MIN_DEFAULT_RA) + guess = MIN_DEFAULT_RA; /* Disable RA if it'd use more 1/50th of RAM. */ if (get_memory_size() > (guess * 50)) |