Hi,
I'm doing benchmark (ceph master branch), with randread 4k qdepth=32,
and rbd_cache=true seem to limit the iops around 40k
no cache
--------
1 client - rbd_cache=false - 1osd : 38300 iops
1 client - rbd_cache=false - 2osd : 69073 iops
1 client - rbd_cache=false - 3osd : 78292 iops
cache
-----
1 client - rbd_cache=true - 1osd : 38100 iops
1 client - rbd_cache=true - 2osd : 42457 iops
1 client - rbd_cache=true - 3osd : 45823 iops
Is it expected ?
fio result rbd_cache=false 3 osd
--------------------------------
rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.1.11
Starting 1 process
rbd engine: RBD version: 0.1.9
Jobs: 1 (f=1): [r(1)] [100.0% done] [307.5MB/0KB/0KB /s] [78.8K/0/0 iops] [eta 00m:00s]
rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=113548: Tue Jun 9 07:48:42 2015
read : io=10000MB, bw=313169KB/s, iops=78292, runt= 32698msec
slat (usec): min=5, max=530, avg=11.77, stdev= 6.77
clat (usec): min=70, max=2240, avg=336.08, stdev=94.82
lat (usec): min=101, max=2247, avg=347.84, stdev=95.49
clat percentiles (usec):
| 1.00th=[ 173], 5.00th=[ 209], 10.00th=[ 231], 20.00th=[ 262],
| 30.00th=[ 282], 40.00th=[ 302], 50.00th=[ 322], 60.00th=[ 346],
| 70.00th=[ 370], 80.00th=[ 402], 90.00th=[ 454], 95.00th=[ 506],
| 99.00th=[ 628], 99.50th=[ 692], 99.90th=[ 860], 99.95th=[ 948],
| 99.99th=[ 1176]
bw (KB /s): min=238856, max=360448, per=100.00%, avg=313402.34, stdev=25196.21
lat (usec) : 100=0.01%, 250=15.94%, 500=78.60%, 750=5.19%, 1000=0.23%
lat (msec) : 2=0.03%, 4=0.01%
cpu : usr=74.48%, sys=13.25%, ctx=703225, majf=0, minf=12452
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.8%, 16=87.0%, 32=12.1%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=91.6%, 8=3.4%, 16=4.5%, 32=0.4%, 64=0.0%, >=64=0.0%
issued : total=r=2560000/w=0/d=0, short=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: io=10000MB, aggrb=313169KB/s, minb=313169KB/s, maxb=313169KB/s, mint=32698msec, maxt=32698msec
Disk stats (read/write):
dm-0: ios=0/45, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=0/24, aggrmerge=0/21, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
sda: ios=0/24, merge=0/21, ticks=0/0, in_queue=0, util=0.00%
fio result rbd_cache=true 3osd
------------------------------
rbd_iodepth32-test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.1.11
Starting 1 process
rbd engine: RBD version: 0.1.9
Jobs: 1 (f=1): [r(1)] [100.0% done] [171.6MB/0KB/0KB /s] [43.1K/0/0 iops] [eta 00m:00s]
rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=113389: Tue Jun 9 07:47:30 2015
read : io=10000MB, bw=183296KB/s, iops=45823, runt= 55866msec
slat (usec): min=7, max=805, avg=21.26, stdev=15.84
clat (usec): min=101, max=4602, avg=478.55, stdev=143.73
lat (usec): min=123, max=4669, avg=499.80, stdev=146.03
clat percentiles (usec):
| 1.00th=[ 227], 5.00th=[ 274], 10.00th=[ 306], 20.00th=[ 350],
| 30.00th=[ 390], 40.00th=[ 430], 50.00th=[ 470], 60.00th=[ 506],
| 70.00th=[ 548], 80.00th=[ 596], 90.00th=[ 660], 95.00th=[ 724],
| 99.00th=[ 844], 99.50th=[ 908], 99.90th=[ 1112], 99.95th=[ 1288],
| 99.99th=[ 2192]
bw (KB /s): min=115280, max=204416, per=100.00%, avg=183315.10, stdev=15079.93
lat (usec) : 250=2.42%, 500=55.61%, 750=38.48%, 1000=3.28%
lat (msec) : 2=0.19%, 4=0.01%, 10=0.01%
cpu : usr=60.27%, sys=12.01%, ctx=2995393, majf=0, minf=14100
IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=13.5%, 16=81.0%, 32=5.3%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=95.0%, 8=0.1%, 16=1.0%, 32=4.0%, 64=0.0%, >=64=0.0%
issued : total=r=2560000/w=0/d=0, short=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: io=10000MB, aggrb=183295KB/s, minb=183295KB/s, maxb=183295KB/s, mint=55866msec, maxt=55866msec
Disk stats (read/write):
dm-0: ios=0/61, merge=0/0, ticks=0/8, in_queue=8, util=0.01%, aggrios=0/29, aggrmerge=0/32, aggrticks=0/8, aggrin_queue=8, aggrutil=0.01%
sda: ios=0/29, merge=0/32, ticks=0/8, in_queue=8, util=0.01%
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