linux-kernel - Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

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Date:	Mon, 11 Sep 2006 11:49:50 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	Pavel Emelianov <xemul@...nvz.org>
Cc:	balbir@...ibm.com, Dave Hansen <haveblue@...ibm.com>,
	Rik van Riel <riel@...hat.com>, Srivatsa <vatsa@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Kirill Korotaev <dev@...ru>, Oleg Nesterov <oleg@...sign.ru>,
	devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added	user
	memory)

On Mon, 2006-09-11 at 12:13 +0400, Pavel Emelianov wrote:

<snip>
> >
> > Don't start the new container or change the guarantees of the existing
> > ones
> > to accommodate this one :) The QoS design (done by the administrator)
> > should
> > take care of such use-cases. It would be perfectly ok to have a container
> > that does not care about guarantees to set their guarantee to 0 and set
> > their limit to the desired value. As Chandra has been stating we need two
> > parameters (guarantee, limit), either can be optional, but not both.
> If I set up 9 groups to have 100Mb limit then I have 100Mb assured (on
> 1Gb node)
> for the 10th one exactly. And I do not have to set up any guarantee as
> it won't affect
> anything. So what a guarantee parameter is needed for?

I do not think it is that simple since
 - there is typically more than one class I want to set guarantee to
 - I will not able to use both limit and guarantee
 - Implementation will not be work-conserving.

Also, How would you configure the following in your model ?

5 classes: Class A(10, 40), Class B(20, 100), Class C (30, 100), Class D
(5, 100), Class E(15, 50); (class_name(guarantee, limit))

"Limit only" approach works for DoS prevention. But for providing QoS
you would need guarantee.
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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