The initial evaluation of the three patches (extents, delayed allocation and extent allocation) shows significant throughput improvements, especially under sequential tests. The tests show that the extents patch significantly reduces the time for large file creation and removal, as well as file rewrite. With extents and extent allocation, the throughput of Direct I/O on the aforementioned Opteron-based workstation is significantly improved, from 315 MB/sec to 500MB/sec, and the CPU usage is significantly dropped from 100% to 50%. In addition, extensive testing on various benchmarks, including dbench, tiobench, FFSB [11] and sqlbench [16], has been done with and without this set of patches. Some initial analysis indicates that the multiple block allocation, when combined with delayed allocation, is a key factor resulting in this improvement. More testing results can be obtained from http://www.bullopensource.org/ext4