Am 27.04.2013 um 22:45 schrieb Mark Nelson <[email protected]>:
> On 04/27/2013 03:13 PM, Stefan Priebe wrote: >> Hello list, >> >> today i was testing next branch against bobtail using a testcluster. I >> upgraded this bobtail one to next branch. >> >> I used QEMU 1.4.1 with librdb (for next branch i applied josh writeback >> patch). My Testsystem had 5 Hosts with one OSD each and set replication >> to 2. >> >> All values where done with 8 jobs in parallel using fio in Qemu Guest. >> >> bobtail: >> rand 4k: write: io=164316KB, bw=1783KB/s, iops=445, runt= 92136msec >> rand 4k: read : io=1117MB, bw=12710KB/s, iops=3177, runt= 90028msec >> seq 4m: write: io=8588MB, bw=97233KB/s, iops=23, runt= 90444msec >> seq 4m: read : io=83616MB, bw=951227KB/s, iops=232, runt= 90013msec >> >> next branch: >> write: io=177236KB, bw=1963KB/s, iops=490, runt= 90284msec >> read : io=223628KB, bw=2408KB/s, iops=601, runt= 92875msec >> write: io=25936MB, bw=294443KB/s, iops=71, runt= 90199msec >> read : io=69856MB, bw=794585KB/s, iops=193, runt= 90025msec > > Was everything else the same between the tests? That does seem unusual. If > it's easy for you to switch between bobtail and next, could you try some 4k > rados bench read tests to see if it's also happening there? I think I got it. Under bobtail the whole stuff was in cache on the osd clients. While under next I tested while they were freshly rebooted ;-( sorry guys. Will retest. Stefan > >> >> Greets, >> Stefan >> >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to [email protected] >> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
