diff options
Diffstat (limited to 'cmds-filesystem.c')
| -rw-r--r-- | cmds-filesystem.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/cmds-filesystem.c b/cmds-filesystem.c index ef1f550b..00e4bfe4 100644 --- a/cmds-filesystem.c +++ b/cmds-filesystem.c @@ -968,7 +968,7 @@ static const char * const cmd_filesystem_defrag_usage[] = { "-f flush data to disk immediately after defragmenting", "-s start defragment only from byte onward", "-l len defragment only up to len bytes", - "-t size target extent size hint", + "-t size target extent size hint (default: 32M)", NULL }; @@ -1029,7 +1029,7 @@ static int cmd_filesystem_defrag(int argc, char **argv) int flush = 0; u64 start = 0; u64 len = (u64)-1; - u64 thresh = 0; + u64 thresh; int i; int recursive = 0; int ret = 0; @@ -1037,6 +1037,13 @@ static int cmd_filesystem_defrag(int argc, char **argv) int compress_type = BTRFS_COMPRESS_NONE; DIR *dirstream; + /* + * Kernel has a different default (256K) that is supposed to be safe, + * but it does not defragment very well. The 32M will likely lead to + * better results and is independent of the kernel default. + */ + thresh = 32 * 1024 * 1024; + defrag_global_errors = 0; defrag_global_verbose = 0; defrag_global_errors = 0; |