Hi. when i put a object(1K) to swift cluster, the performance is so bad, QPS only 16. and i found the function: "_finalize_put" in file Diskfile.py cost too much time . mainly caused by the fsync() inside _finalize_put operation, the fsync() will cost 30ms when write 1KB data to disk . as a result the PUT performance is bad. how can tuning the performance ? and why call fsync() function? thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/foundation/attachments/20141010/1f928fb5/attachment.html>