From c7e7576e4af842598621a934117bc665fbb00def Mon Sep 17 00:00:00 2001 From: Wang Shilong Date: Tue, 15 Sep 2020 15:06:11 +0800 Subject: [PATCH] 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. E2fsprogs-commit: 9226b3264b74044013f4933280b1989c33be42f3 Change-Id: Ia503b4f73dc8f3d5e6be705c7311bdacc5b874a9 Signed-off-by: Wang Shilong Reviewed-by: Andreas Dilger Signed-off-by: Theodore Ts'o --- e2fsck/readahead.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/e2fsck/readahead.c b/e2fsck/readahead.c index 38d4ec4..40b7366 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)) -- 1.8.3.1