Dear XFS community & developers,
I am using CentOS 6.3 and xfs as base file system and use RAID5 as hardware storage.
Detail environment as follow:
OS: CentOS 6.3
Kernel: kernel-2.6.32-279.el6.x86_64
XFS option info(df output): /dev/sdb1 on /data type xfs (rw,noatime,nodiratime,nobarrier)
Detail phenomenon:
# df
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 29G 17G 11G 61% /
/dev/sdb1 893G 803G 91G 90% /data
/dev/sda4 2.2T 1.6T 564G 75% /data1
# time touch /data1/1111
real 0m23.043s
user 0m0.001s
sys 0m0.349s
# perf top
Events: 6K cycles
16.96% [xfs] [k] xfs_inobt_get_rec
11.95% [xfs] [k] xfs_btree_increment
11.16% [xfs] [k] xfs_btree_get_rec
7.39% [xfs] [k] xfs_btree_get_block
5.02% [xfs] [k] xfs_dialloc
4.87% [xfs] [k] xfs_btree_rec_offset
4.33% [xfs] [k] xfs_btree_readahead
4.13% [xfs] [k] _xfs_buf_find
4.05% [kernel] [k] intel_idle
2.89% [xfs] [k] xfs_btree_rec_addr
1.04% [kernel] [k] kmem_cache_free
It seems that some xfs kernel function spend much time (xfs_inobt_get_rec, xfs_btree_increment, etc.)
I found a bug in bugzilla [1], is that is the same issue like this?
It's very greatly appreciated if you can give constructive suggestion about this issue, as It's really hard to reproduce from another system and it's not possible to do upgrade on that online machine.
Thanks in advance
Qiang
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