linux-kernel - Re: [RFC] CPU hard limits

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Message-ID: <4A293196.2060006@nortel.com>
Date:	Fri, 05 Jun 2009 08:54:14 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Avi Kivity <avi@...hat.com>
CC:	balbir@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelyanov <xemul@...nvz.org>, kvm@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Herbert Poetzl <herbert@...hfloor.at>
Subject: Re: [RFC] CPU hard limits

Avi Kivity wrote:

> I am selling virtual private servers.  A 10% cpu share costs $x/month, 
> and I guarantee you'll get that 10%, or your money back.  On the other 
> hand, I want to limit cpu usage to that 10% (maybe a little more) so 
> people don't buy 10% shares and use 100% on my underutilized servers.  
> If they want 100%, let them pay for 100%.

What about taking a page from the networking folks and specifying cpu
like a networking SLA?

Something like "group A is guaranteed X percent (or share) of the cpu,
but it is allowed to burst up to Y percent for Z milliseconds"

If a rule of this form was the first-class citizen, it would provide
both guarantees, limits, and flexible behaviour.

Chris
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