I want to record with the ceph-devel archive results from testing limits of xattrs for Linux filesystems used with Ceph.
Script that creates xattrs with name user.test1, user.test2, …. on a single file
3.10 linux kernel
ext4
value bytes number of entries
1 148
16 103
256 14
512 7
1024 3
4036 1
Beyond this immediately get ENOSPC
btrfs
value bytes number of entries
8 10k
16 10k
32 10k
64 10k
128 10k
256 10k
512 10k slow but worked 1,000,000 got completely hung for minutes at a time during removal strace showed no forward progress
1024 10k
2048 10k
3096 10k
Beyond this you start getting ENOSPC after fewer entries
xfs (limit entries due to xfs crash with 10k entries)
value bytes number of entries
1 1k
8 1k
16 1k
32 1k
64 1k
128 1k
256 1k
512 1k
1024 1k
2048 1k
4096 1k
8192 1k
16384 1k
32768 1k
65536 1k
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