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

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Message-ID: <4A2B59C5.7060902@redhat.com>
Date:	Sun, 07 Jun 2009 09:10:13 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Chris Friesen <cfriesen@...tel.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

Chris Friesen wrote:
> 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.
>   

I think you're introducing a new control (guarantees, limits, burst 
limit), but I like it.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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