[Devel] Re: [PATCH -mm 0/6] cgroup: block device i/o controller (v11)

Dong-Jae Kang baramsori72 at gmail.com
Tue Oct 14 02:17:30 PDT 2008


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