Message-ID: <44F6C44D.3040801@in.ibm.com>
Date: Thu, 31 Aug 2006 16:43:17 +0530
From: Balbir Singh <balbir@in.ibm.com>
Reply-To: balbir@in.ibm.com
Organization: IBM India Private Limited
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To: Martin Ohlin <martin.ohlin@control.lth.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: A nice CPU resource controller
References: <44F5AB45.8030109@control.lth.se> <661de9470608300841o757a8704te4402a7015b230c5@mail.gmail.com> <44F6B80D.2020409@control.lth.se>
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Martin Ohlin wrote:
> Balbir Singh wrote:
> 
>> The CKRM e-series is a PID based CPU Controller. It did a good job of
>> controlling and smoothing out the load (and variations) and even
>> worked with groups. But it achieved all this through some amount of
>> complexity.
> 
> I have now downloaded and looked at the code you refer to. But as far as 
> I can see, the PID controller is only used for load balancing between 
> CPUs, not for controlling the bandwidth/time of individual tasks. Is 
> this correct or did I miss something?
> 
> /Martin

Yes, the PID controller is used for load balancing.

-- 

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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