linux-kernel - Re: [PATCH] kvm: handle last_boosted

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Message-ID: <4FEC84BD.6030304@linux.vnet.ibm.com>
Date:	Thu, 28 Jun 2012 21:52:21 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Andrew Jones <drjones@...hat.com>
CC:	Rik van Riel <riel@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
	Gleb Natapov <gleb@...hat.com>,
	chegu vinod <chegu_vinod@...com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] kvm: handle last_boosted_vcpu = 0 case

On 06/28/2012 09:30 PM, Andrew Jones wrote:
>
>
> ----- Original Message -----
>> In summary, current PV has huge benefit on non-PLE machine.
>>
>> On PLE machine, the results become very sensitive to load, type of
>> workload and SPIN_THRESHOLD. Also PLE interference has significant
>> effect on them. But still it has slight edge over non PV.
>>
>
> Hi Raghu,
>
> sorry for my slow response. I'm on vacation right now (until the
> 9th of July) and I have limited access to mail.

Ok. Happy Vacation :)

Also, thanks for
> continuing the benchmarking. Question, when you compare PLE vs.
> non-PLE, are you using different machines (one with and one
> without), or are you disabling its use by loading the kvm module
> with the ple_gap=0 modparam as I did?

Yes, I am doing the same when I say with PLE disabled and comparing the
benchmarks (i.e loading kvm module with ple_gap=0).

But older non-PLE results were on a different machine altogether. (I
had limited access to PLE machine).


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