Re: [Ioband-devel] range-bw and large i/o

[<yam...@va...>]

hi,

> Hi, Takashi-san
> 
> 2010/4/13 YAMAMOTO Takashi <yam...@va...>
> 
>> hi,
>>
>> >>> > And I like to issue the problem about ioband
>> >>> > Currently, ioband controller has big overhead in controlling I/O
>> >>> bandwidth.
>> >>> > for example,
>> >>> > the overhead is seriously arised according to the increasement of
>> >>> processes
>> >>> > or process grorups(using cgroup)
>> >>> > especially, weight policy is more serious now.
>> >>> > If you analyze the source code these days, can you take a
>> consideration
>> >>> for
>> >>> > that? ^^
>> >>>
>> >>> i have no idea right now.  i'll keep it in mind.
>> >>> do you have any numbers of the "big overhead"?
>> >>>
>> >>
>> >> Yes, I attached evaluation result file(excel file)
>> >> So, you can refer the file to understand the situation.
>> >
>> > thanks.
>>
>> can you explain a bit?
>>
>> what is X-axis?
>>
>> X-axis means time as showed in graph.
> the result was picked out in every second
> 
> 
>> what do total-BW, range-bw, weight mean?
>>
> 
> TotalBW means origianl disk I/O bandwidth without ioband controller.
> and range-bw and weight are the total bandwidth by control policy that I
> applied in the test.

do you mean that you run the same workload 3 times with different
configurations?  (no ioband, range-bw, and weight)

do you see the similar performance drop once you configure ioband,
regardless of values of min_bw, max_bw, etc?  otherwise, can you
show me those values which you used for this graphs?

YAMAMOTO Takashi