On 04/28/2013 07:21 AM, Stefan Priebe - Profihost AG wrote:
Am 27.04.2013 um 22:45 schrieb Mark Nelson <mark.nelson@xxxxxxxxxxx>:
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.
No worries! Unless I'm explicitly testing from cache, I always do a
sync and drop_caches on both the clients and servers before doing any tests.
Stefan
Greets,
Stefan
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