linux-kernel - Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

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Message-ID: <4FFC17D8.5010108@linux.vnet.ibm.com>
Date:	Tue, 10 Jul 2012 17:24:00 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	habanero@...ux.vnet.ibm.com
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Avi Kivity <avi@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	S390 <linux-s390@...r.kernel.org>,
	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
	LKML <linux-kernel@...r.kernel.org>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>, linux390@...ibm.com,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

On 07/10/2012 03:17 AM, Andrew Theurer wrote:
> On Mon, 2012-07-09 at 11:50 +0530, Raghavendra K T wrote:
>> Currently Pause Looop Exit (PLE) handler is doing directed yield to a
>> random VCPU on PL exit. Though we already have filtering while choosing
>> the candidate to yield_to, we can do better.
>
> Hi, Raghu.
>
[...]
>
> Can you briefly explain the 1x and 2x configs?  This of course is highly
> dependent whether or not HT is enabled...
>

Sorry if I had not made very clear in earlier threads. Have you applied
Rik's following patch for base. without this you could see some 
inconsistent results perhaps.

https://lkml.org/lkml/2012/6/19/401

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