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SubjectRe: [PATCH -mm 0/6] cgroup: block device i/o controller (v11)
Hi, Andrea

thank you for your contribution to community
these days, I am testing several IO controllers in container ML,
dm-ioband by Ryo tsuruta(v1.7.0), 2-Layer CFQ by Satoshi and your
io-throttle(v11)

I have several question about io-throttle
below is my test reusult of io-throttle(v11) with xdd 6.5
But, I think I have something wrong, as showed in result
In direct IO mode, Only read operation was controlled by io-throttle
Can you check my test procedure and result and comments to me about that

additionally, your testing shell script(run_io_throttle_test.sh) for
io-throttle was not updated for new io-throttle
so, it could be operated after I fixed it

-----------------------------------------------------------------------------------
- Test System Information

Computer Name, localhost.localdomain, User Name, root
OS release and version, Linux 2.6.27-rc5-mm1 #1 SMP Thu Oct 9 18:27:09 KST 2008
Machine hardware type, i686
Number of processors on this system, 1
Page size in bytes, 4096
Number of physical pages, 515885
Megabytes of physical memory, 2015
Target[0] Q[0], /dev/sdb
Per-pass time limit in seconds, 30
Blocksize in bytes, 512
Request size, 128, blocks, 65536, bytes
Number of Requests, 16384
Number of MegaBytes, 512 or 1024
Direct I/O, disabled or enable
Seek pattern, sequential
Queue Depth, 1

- Test Procedure

 mkdir /dev/blockioctl
 mount -t cgroup -o blockio cgroup /dev/blockioctl
 mkdir /dev/blockioctl/cgroup-1
 mkdir /dev/blockioctl/cgroup-2
 mkdir /dev/blockioctl/cgroup-3
 echo /dev/sdb:$((1024*1024)):0:0 >
/dev/blockioctl/cgroup-1/blockio.bandwidth-max
 echo /dev/sdb:$((2*1024*1024)):0:0 >
/dev/blockioctl/cgroup-2/blockio.bandwidth-max
 echo /dev/sdb:$((3*1024*1024)):0:0 >
/dev/blockioctl/cgroup-3/blockio.bandwidth-max
 in terminal 1, echo $$ > /dev/blockioctl/cgroup-1/tasks
 in terminal 2, echo $$ > /dev/blockioctl/cgroup-2/tasks
 in terminal 3, echo $$ > /dev/blockioctl/cgroup-3/tasks
 in each terminal, xdd.linux -op write( or read ) -targets 1 /dev/sdb
-blocksize 512 -reqsize 128 -mbytes 1024( or 512 ) -timelimit 30
-verbose –dio(enable or disable)

- setting status information

[root@localhost blockioctl]# cat ./cgroup-1/blockio.bandwidth-max
8 16 1048576 0 0 0 13016
[root@localhost blockioctl]# cat ./cgroup-2/blockio.bandwidth-max
8 16 2097152 0 0 0 11763
[root@localhost blockioctl]# cat ./cgroup-3/blockio.bandwidth-max
8 16 3145728 0 0 0 11133

- Test Result
xdd.linux -op read -targets 1 /dev/sdb -blocksize 512 -reqsize 128
-mbytes 512 -timelimit 30 -dio -verbose

cgroup-1

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 31522816 481 30.005 1.051 16.03 0.0624
0.00 read 65536
0 1 31522816 481 30.005 1.051 16.03 0.0624
0.00 read 65536
1 1 31522816 481 30.005 1.051 16.03 0.0624
0.00 read 65536

cgroup-2

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 62980096 961 30.001 2.099 32.03 0.0312
0.00 read 65536
0 1 62980096 961 30.001 2.099 32.03 0.0312
0.00 read 65536
1 1 62980096 961 30.001 2.099 32.03 0.0312
0.00 read 65536

cgroup-3

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 94437376 1441 30.003 3.148 48.03 0.0208
0.00 read 65536
0 1 94437376 1441 30.003 3.148 48.03 0.0208
0.00 read 65536
1 1 94437376 1441 30.003 3.148 48.03 0.0208
0.00 read 65536

xdd.linux -op write -targets 1 /dev/sdb -blocksize 512 -reqsize 128
-mbytes 512 -timelimit 30 -dio –verbose

cgroup-1

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 640221184 9769 30.097 21.272 324.58 0.0031
0.00 write 65536
0 1 640221184 9769 30.097 21.272 324.58 0.0031
0.00 write 65536
1 1 640221184 9769 30.097 21.272 324.58 0.0031
0.00 write 65536

cgroup-2

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 633798656 9671 30.001 21.126 322.36 0.0031
0.00 write 65536
0 1 633798656 9671 30.001 21.126 322.36 0.0031
0.00 write 65536
1 1 633798656 9671 30.001 21.126 322.36 0.0031
0.00 write 65536

cgroup-3

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 630652928 9623 30.001 21.021 320.76 0.0031
0.00 write 65536
0 1 630652928 9623 30.001 21.021 320.76 0.0031
0.00 write 65536
1 1 630652928 9623 30.001 21.021 320.76 0.0031
0.00 write 65536

xdd.linux -op read -targets 1 /dev/sdb -blocksize 512 -reqsize 128
-mbytes 1024 -timelimit 30 -verbose

cgroup-1

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 70123520 1070 30.150 2.326 35.49 0.0282
0.00 read 65536
0 1 70123520 1070 30.150 2.326 35.49 0.0282
0.00 read 65536
1 1 70123520 1070 30.150 2.326 35.49 0.0282
0.00 read 65536

cgroup-2

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 70844416 1081 30.063 2.357 35.96 0.0278
0.00 read 65536
0 1 70844416 1081 30.063 2.357 35.96 0.0278
0.00 read 65536
1 1 70844416 1081 30.063 2.357 35.96 0.0278
0.00 read 65536

cgroup-3

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 72155136 1101 30.204 2.389 36.45 0.0274
0.00 read 65536
0 1 72155136 1101 30.204 2.389 36.45 0.0274
0.00 read 65536
1 1 72155136 1101 30.204 2.389 36.45 0.0274
0.00 read 65536

xdd.linux -op write -targets 1 /dev/sdb -blocksize 512 -reqsize 128
-mbytes 1024 -timelimit 30 -verbose

cgroup-1

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 818610176 12491 30.031 27.258 415.93 0.0024
0.00 write 65536
0 1 818610176 12491 30.031 27.258 415.93 0.0024
0.00 write 65536
1 1 818610176 12491 30.031 27.258 415.93 0.0024
0.00 write 65536

cgroup-2

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 848494592 12947 30.066 28.221 430.62 0.0023
0.00 write 65536
0 1 848494592 12947 30.066 28.221 430.62 0.0023
0.00 write 65536
1 1 848494592 12947 30.066 28.221 430.62 0.0023
0.00 write 65536

cgroup-3

T Q Bytes Ops Time Rate IOPS Latency
%CPU OP_Type ReqSize
0 1 786563072 12002 30.078 26.151 399.03 0.0025
0.00 write 65536
0 1 786563072 12002 30.078 26.151 399.03 0.0025
0.00 write 65536
1 1 786563072 12002 30.078 26.151 399.03 0.0025
0.00 write 65536

Best Regards,
Dong-Jae Kang


2008/10/7 Andrea Righi <righi.andrea@gmail.com>:
>
> The objective of the i/o controller is to improve i/o performance
> predictability of different cgroups sharing the same block devices.
>
> Respect to other priority/weight-based solutions the approach used by this
> controller is to explicitly choke applications' requests that directly (or
> indirectly) generate i/o activity in the system.
>
> The direct bandwidth and/or iops limiting method has the advantage of improving
> the performance predictability at the cost of reducing, in general, the overall
> performance of the system (in terms of throughput).
>
> Detailed informations about design, its goal and usage are described in the
> documentation.
>
> Patchset against 2.6.27-rc5-mm1:
>
> [PATCH 0/6] cgroup: block device i/o controller (v11)
> [PATCH 1/6] i/o controller documentation
> [PATCH 2/6] introduce ratelimiting attributes and functionality to res_counter
> [PATCH 3/6] i/o controller infrastructure
> [PATCH 4/6] memcg: interface to charge the right cgroup of asynchronous i/o activity
> [PATCH 5/6] i/o controller instrumentation: accounting and throttling
> [PATCH 6/6] export per-task i/o throttling statistics to userspace
>
> The all-in-one patch (and previous versions) can be found at:
> http://download.systemimager.org/~arighi/linux/patches/io-throttle/
>
> There are no significant changes respect to v10, I've only implemented/fixed
> some suggestions I received.
>
> Changelog: (v10 -> v11)
>
> * report per block device i/o statistics (total bytes read/written and iops)
> in blockio.stat for i/o limited cgroups
> * distinct bandwidth and iops statistics: both in blockio.throttlecnt and
> /proc/PID/io-throttle-stat (suggested by David Radford)
> * merge res_counter_ratelimit functionality into res_counter, to avoid code
> duplication (suggested by Paul Manage)
> * use kernel-doc style for documenting struct res_counter attributes
> (suggested by Randy Dunalp)
> * udpated documentation
>
> Thanks to all for the feedback!
> -Andrea
>
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