Hi Stephan, Do you have same performance with read ? Did you have done some iostats ? how much time to flush from journal to disks ? ----- Mail original ----- De: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx> À: "Mark Nelson" <mark.nelson@xxxxxxxxxxx> Cc: ceph-devel@xxxxxxxxxxxxxxx Envoyé: Vendredi 25 Mai 2012 14:10:16 Objet: Re: poor OSD performance using kernel 3.4 Even with v3.3-rc1 is pretty often 0. Am 25.05.2012 13:31, schrieb Stefan Priebe - Profihost AG: > > 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 -- -- Alexandre D erumier Ingénieur Système Fixe : 03 20 68 88 90 Fax : 03 20 68 90 81 45 Bvd du Général Leclerc 59100 Roubaix - France 12 rue Marivaux 75002 Paris - France -- 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
