Hi guys,
I'm using this simple trim test on a raw SSD but getting very low
performance. Bandwidth seems to be tied to the block size. Am I
doing something wrong?
[trim]
rw=randtrim
bs=4k
ioengine=sync
filename=/dev/sdb
runtime=30
trim: (g=0): rw=randtrim, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
fio-2.1
Starting 1 process
Jobs: 1 (f=1): [d] [100.0% done] [0KB/0KB/400KB /s] [0/0/100 iops] [eta 00m:00s]
trim: (groupid=0, jobs=1): err= 0: pid=4616: Wed Jul 24 12:54:10 2013
trim: io=11996KB, bw=409408B/s, iops=99, runt= 30004msec
clat (usec): min=4597, max=20401, avg=9999.91, stdev=431.52
lat (usec): min=4597, max=20401, avg=10000.15, stdev=431.53
clat percentiles (usec):
| 1.00th=[ 8768], 5.00th=[ 9920], 10.00th=[10048], 20.00th=[10048],
| 30.00th=[10048], 40.00th=[10048], 50.00th=[10048], 60.00th=[10048],
| 70.00th=[10048], 80.00th=[10048], 90.00th=[10048], 95.00th=[10048],
| 99.00th=[11328], 99.50th=[11328], 99.90th=[14912], 99.95th=[20096],
| 99.99th=[20352]
bw (KB /s): min= 385, max= 401, per=100.00%, avg=399.76, stdev= 1.99
lat (msec) : 10=84.06%, 20=15.87%, 50=0.07%
cpu : usr=0.11%, sys=0.12%, ctx=2999, majf=0, minf=24
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=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=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued : total=r=0/w=0/d=2999, short=r=0/w=0/d=0
Run status group 0 (all jobs):
TRIM: io=11996KB, aggrb=399KB/s, minb=399KB/s, maxb=399KB/s,
mint=30004msec, maxt=30004msec
Disk stats (read/write):
sdb: ios=84/2988, merge=0/0, ticks=4/29832, in_queue=29840, util=99.47%
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