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

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Message-ID: <168f205d-d65f-4864-99c8-363b12818a9b@zmail17.collab.prod.int.phx2.redhat.com>
Date:	Thu, 28 Jun 2012 12:00:46 -0400 (EDT)
From:	Andrew Jones <drjones@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.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



----- 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. 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?

Drew
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