[lxc-users] disk IO limit

[Fajar A. Nugraha]

with dd? probably using "oflag=sync" (see "man dd" for details)

-- 
Fajar


On Thu, Jul 17, 2014 at 3:41 PM, Divya Vyas <dvyas at mvista.com> wrote:

> Hi Fajar,
>
> Thanks for your reply . Can you please help me how can I test the assigned
> bandwidth?
>
>
> On Thu, Jul 17, 2014 at 1:54 PM, Fajar A. Nugraha <list at fajar.net> wrote:
>
>> On Thu, Jul 17, 2014 at 3:18 PM, Divya Vyas <dvyas at mvista.com> wrote:
>>
>>> Hi ,
>>>
>>> I am using two containers on top of disk /dev/sda  and I want to limit a
>>> disk IO write speed to 1 mb/sec of one of the containers.
>>>
>>> I gave this command ->
>>>  echo "8:0 1048576" >
>>> /sys/fs/cgroup/blkio//lxc/vm5/blkio.throttle.write_bps_device
>>> But not getting the desired output.
>>>
>>> dd if=/dev/zero of=/dev/sda bs=512 count=1000
>>> 1000+0 records in
>>> 1000+0 records out
>>> 512000 bytes (512 kB) copied, 0.00180087 s, 284 MB/s
>>>
>>> Does anyone tried limiting the disk IO of only one container?
>>>
>>>
>>
>> Short version: it won't work the way you want to. dd is async by default.
>>
>> http://www.mjmwired.net/kernel/Documentation/cgroups/blkio-controller.txt
>> , look at the end.
>>
>> --
>> Fajar
>>
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>
>
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