[Users] iops limiting
Mark Johanson
mjohanson at a2hosting.com
Wed Jan 22 12:07:28 PST 2014
I'm not sure if I am doing something wrong (which is very possible) but
I am not seeing any kind of significant change in numbers when going
from a iops unlimited setting on a vps to a iops 500 limit on the same
vps. The vm is set via:
vzctl set 101 --iopslimit 1000 --save
rebooted and cat'd the conf file does show that the 500 limit is there:
IOPSLIMIT="500"
vzctl version 4.6.1
2.6.32-042stab084.14 #1 SMP Mon Dec 16 18:16:56 MSK 2013 x86_64 x86_64
x86_64 GNU/Linux
For example the following comes from a variety of tests running on the
disks:
_Unlimited test_
Downloading FIO...
Downloading IOPing...
Downloading UnixBench...
Creating a file to use.
THETEST -> IOPS Transfer
4096 direct: 108881 446 MB/s
4096 dsync: 31 129 kB/s
4096 sync: 20 85.3 kB/s
4096 fdatasync: 56781 233 MB/s
65536 direct: 6235 409 MB/s
65536 dsync: 21 1.4 MB/s
65536 sync: 21 1.4 MB/s
65536 fdatasync: 3969 260 MB/s
1048576 direct: 414 435 MB/s
1048576 dsync: 15 16.1 MB/s
1048576 sync: 15 16.0 MB/s
1048576 fdatasync: 231 243 MB/s
Running IOPing I/O benchmark...
IOping -> IOPS Transfer
Direct Small IO
Direct Large IO
Serverbear IOping Tests IOPS Transfer
IOPing Default 93 0.4
IOPing seek rate: 192 0.7
IOPing sequential: 945 236.2
IOPing cached: 325603 1271.9
Time,Hostname,Comment,4096 direct-iops,4096 direct-rate,4096 direct-unit,4096 dsync-iops,4096 dsync-rate,4096 dsync-unit,4096 sync-iops,4096 sync-rate,4096 sync-unit,4096 fdatasync-iops,4096 fdatasync-rate,4096 fdatasync-unit,65536 direct-iops,65536 direct-rate,65536 direct-unit,65536 dsync-iops,65536 dsync-rate,65536 dsync-unit,65536 sync-iops,65536 sync-rate,65536 sync-unit,65536 fdatasync-iops,65536 fdatasync-rate,65536 fdatasync-unit,1048576 direct-iops,1048576 direct-rate,1048576 direct-unit,1048576 dsync-iops,1048576 dsync-rate,1048576 dsync-unit,1048576 sync-iops,1048576 sync-rate,1048576 sync-unit,1048576 fdatasync-iops,1048576 fdatasync-rate,1048576 fdatasync-unit,IOp 4k D-iops:IOp 4k D-megs,IOp 64k D-iops,IOp 64k D-megs,SB Default-iops,SB Default-megs,SB Seek rate-iops,SB Seek rate-megs,SB Sequential-iops,SB Sequential-megs,SB Cached-iops,SB Cached-megs,
1390349785,server.example.com,,108881,446,MB/s,31,129,kB/s,20,85.3,kB/s,56781,233,MB/s,6235,409,MB/s,21,1.4,MB/s,21,1.4,MB/s,3969,260,MB/s,414,435,MB/s,15,16.1,MB/s,15,16.0,MB/s,231,243,MB/s,,,,,93,0.4,192,0.7,945,236.2325603,1271.9,
_500 Limited Test_
THETEST -> IOPS Transfer
4096 direct: 95545 391 MB/s
4096 dsync: 40 164 kB/s
4096 sync: 39 163 kB/s
4096 fdatasync: 61423 252 MB/s
65536 direct: 6676 438 MB/s
65536 dsync: 40 2.7 MB/s
65536 sync: 40 2.6 MB/s
65536 fdatasync: 3852 252 MB/s
1048576 direct: 402 422 MB/s
1048576 dsync: 27 28.8 MB/s
1048576 sync: 27 28.5 MB/s
1048576 fdatasync: 238 250 MB/s
Running IOPing I/O benchmark...
IOping -> IOPS Transfer
Direct Small IO
Direct Large IO
Serverbear IOping Tests IOPS Transfer
IOPing Default 117 0.5
IOPing seek rate: 196 0.8
IOPing sequential: 805 201.2
IOPing cached: 325274 1270.6
Time,Hostname,Comment,4096 direct-iops,4096 direct-rate,4096 direct-unit,4096 dsync-iops,4096 dsync-rate,4096 dsync-unit,4096 sync-iops,4096 sync-rate,4096 sync-unit,4096 fdatasync-iops,4096 fdatasync-rate,4096 fdatasync-unit,65536 direct-iops,65536 direct-rate,65536 direct-unit,65536 dsync-iops,65536 dsync-rate,65536 dsync-unit,65536 sync-iops,65536 sync-rate,65536 sync-unit,65536 fdatasync-iops,65536 fdatasync-rate,65536 fdatasync-unit,1048576 direct-iops,1048576 direct-rate,1048576 direct-unit,1048576 dsync-iops,1048576 dsync-rate,1048576 dsync-unit,1048576 sync-iops,1048576 sync-rate,1048576 sync-unit,1048576 fdatasync-iops,1048576 fdatasync-rate,1048576 fdatasync-unit,IOp 4k D-iops:IOp 4k D-megs,IOp 64k D-iops,IOp 64k D-megs,SB Default-iops,SB Default-megs,SB Seek rate-iops,SB Seek rate-megs,SB Sequential-iops,SB Sequential-megs,SB Cached-iops,SB Cached-megs,
1390359348,server.example.com,,95545,391,MB/s,40,164,kB/s,39,163,kB/s,61423,252,MB/s,6676,438,MB/s,40,2.7,MB/s,40,2.6,MB/s,3852,252,MB/s,402,422,MB/s,27,28.8,MB/s,27,28.5,MB/s,238,250,MB/s,,,,,117,0.5,196,0.8,805,201.2325274,1270.6,
Does there need to be a specific setting enabled on the node, specific
type of scheduler, etc that is not being set and why I am not seeing any
significant changes? Any help would be great.
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