linux-kernel - Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler

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Message-ID: <877gqxfg2g.fsf@abhimanyu.in.ibm.com>
Date:	Thu, 11 Oct 2012 16:09:35 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	habanero@...ux.vnet.ibm.com,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>, KVM <kvm@...r.kernel.org>,
	Jiannan Ouyang <ouyang@...pitt.edu>,
	chegu vinod <chegu_vinod@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Gleb Natapov <gleb@...hat.com>,
	Andrew Jones <drjones@...hat.com>
Subject: Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler

On Wed, 10 Oct 2012 09:24:55 -0500, Andrew Theurer <habanero@...ux.vnet.ibm.com> wrote:
> 
> Below is again 8 x 20-way VMs, but this time I tried out Nikunj's gang
> scheduling patches.  While I am not recommending gang scheduling, I
> think it's a good data point.  The performance is 3.88x the PLE result.
> 
> https://docs.google.com/open?id=0B6tfUNlZ-14wWXdscWcwNTVEY3M

That looks pretty good and serves the purpose. And the result says it all.

> Note that the task switching intervals of 4ms are quite obvious again,
> and this time all vCPUs from same VM run at the same time.  It
> represents the best possible outcome.
> 
> 
> Anyway, I thought the bitmaps might help better visualize what's going
> on.
> 
> -Andrew
> 

Regards
Nikunj

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