Some speed tests with different Kernel Versions. The same applies to other FS like btrfs. I used "rados -p data bench 100 write -t 16" for all tests and a freshly created FS. mount options were always: noatime,nodiratime,nobarrier. 3.0.30 with XFS speed is always between 120 and 160MB/s Total time run: 100.510061 Total writes made: 3605 Write size: 4194304 Bandwidth (MB/sec): 143.468 Average Latency: 0.445714 Max latency: 1.99929 Min latency: 0.084812 3.2.18 with XFS speed is between 40 and 170MB/s Total time run: 100.795653 Total writes made: 3384 Write size: 4194304 Bandwidth (MB/sec): 134.292 Average Latency: 0.476297 Max latency: 2.92075 Min latency: 0.084884 3.3.7 with XFS !! speed heavily jumps between 0 and 170 MB/s !! Total time run: 107.398166 Total writes made: 2455 Write size: 4194304 Bandwidth (MB/sec): 91.435 Average Latency: 0.699819 Max latency: 13.8117 Min latency: 0.084624 3.4 with XFS !! speed heavily jumps between 0 and 130 MB/s - most if the time it's near 0 !! Total time run: 115.433531 Total writes made: 468 Write size: 4194304 Bandwidth (MB/sec): 16.217 Average Latency: 3.9452 Max latency: 53.4356 Min latency: 0.091276 Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
