linux-kernel - Re: [PATCH 1/3] i/o bandwidth controller documentation

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Date:	Thu, 12 Jun 2008 00:51:57 +0200
From:	Andrea Righi <righi.andrea@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	balbir@...ux.vnet.ibm.com, menage@...gle.com, matt@...ehost.com,
	roberto@...it.it, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] i/o bandwidth controller documentation

Randy Dunlap wrote:
> On Sat,  7 Jun 2008 00:27:28 +0200 Andrea Righi wrote:
> 
>> Documentation of the block device I/O bandwidth controller: description, usage,
>> advantages and design.
>>
>> Signed-off-by: Andrea Righi <righi.andrea@...il.com>
>> ---
>>  Documentation/controllers/io-throttle.txt |  150 +++++++++++++++++++++++++++++
>>  1 files changed, 150 insertions(+), 0 deletions(-)
>>  create mode 100644 Documentation/controllers/io-throttle.txt
>>
>> diff --git a/Documentation/controllers/io-throttle.txt b/Documentation/controllers/io-throttle.txt
>> new file mode 100644
>> index 0000000..5373fa8
>> --- /dev/null
>> +++ b/Documentation/controllers/io-throttle.txt
>> @@ -0,0 +1,150 @@
>> +
>> +               Block device I/O bandwidth controller
>> +
>> +1. Description
>> +
>> +This controller allows to limit the I/O bandwidth of specific block devices for
>> +specific process containers (cgroups) imposing additional delays on I/O
>> +requests for those processes that exceed the limits defined in the control
>> +group filesystem.
>> +
>> +Bandwidth limiting rules offer better control over QoS with respect to priority
>> +or weight-based solutions that only give information about applications'
>> +relative performance requirements.
>> +
>> +The goal of the I/O bandwidth controller is to improve performance
>> +predictability and QoS of the different control groups sharing the same block
>> +devices.
>> +
>> +NOTE: if you're looking for a way to improve the overall throughput of the
>> +system probably you should use a different solution.
>> +
>> +2. User Interface
>> +
>> +A new I/O bandwidth limitation rule is described using the file
>> +blockio.bandwidth.
>> +
>> +The same file can be used to set multiple rules for different block devices
>> +relatively to the same cgroup.
> 
>    relative
> 

I will fix it in the next version.

Thanks again Randy.

-Andrea
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