For the 8GB IOzone write test, ZFS on the OCZ Solid 2 SSD was right in the middle between EXT4 and Btrfs while on the HDD it was tied with EXT4 for being the slowest.
EXT4 and ZFS were very slow for the Threaded I/O Tester with conducting random writes of 16 threads and each thread being 64MB in size.
The Compile Bench initial create ZFS results were right in the middle between EXT4 and ZFS on the two drives.
Well, there you have the very latest LLNL ZFS results for Linux. This native ZFS implementation for Linux is still a mixed bag with the performance changing vastly depending upon workload and whether using a hard drive or solid-state drive for storage. Due to ZFS not being mainline in the Linux kernel and other factors, most will probably be best off sticking to EXT4 or Btrfs (or even XFS) for their Linux file-system.
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