linux-kernel - Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

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Date:	Mon, 07 May 2012 16:28:32 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...nel.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Attilio Rao <attilio.rao@...rix.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	linux-doc@...r.kernel.org, KVM <kvm@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Stephan Diestelhorst <stephan.diestelhorst@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

On 05/07/2012 02:02 PM, Avi Kivity wrote:
> On 05/07/2012 11:29 AM, Ingo Molnar wrote:
>> This is looking pretty good and complete now - any objections
>> from anyone to trying this out in a separate x86 topic tree?
>
> No objections, instead an
>
> Acked-by: Avi Kivity<avi@...hat.com>
>

Thank you.

Here is a benchmark result with the patches.

3 guests with 8VCPU, 8GB RAM, 1 used for kernbench
(kernbench -f -H -M -o 20) other for cpuhog (shell script while
true with an instruction)

unpinned scenario
1x: no hogs
2x: 8hogs in one guest
3x: 8hogs each in two guest

BASE: 3.4-rc4 vanilla with CONFIG_PARAVIRT_SPINLOCK=n
BASE+patch: 3.4-rc4 + debugfs + pv patches with CONFIG_PARAVIRT_SPINLOCK=y

Machine : IBM xSeries with Intel(R) Xeon(R) x5570 2.93GHz CPU (Non PLE) 
with 8 core , 64GB RAM

(Less is better. Below is time elapsed in sec for x86_64_defconfig (3+3 
runs)).

		 BASE                    BASE+patch            %improvement
		 mean (sd)               mean (sd)
case 1x:	 66.0566 (74.0304) 	 61.3233 (68.8299) 	7.16552
case 2x:	 1253.2 (1795.74) 	 131.606 (137.358) 	89.4984
case 3x:	 3431.04 (5297.26) 	 134.964 (149.861) 	96.0664


Will be working on further analysis with other benchmarks 
(pgbench/sysbench/ebizzy...) and further optimization.

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